A Must you open the window
B Shall you open th window
C Could you open the window
D A or C
A studying
B to study
C study
D that I study
A do up
B do in
C do through
D do over
A should have done
B may have done
C need to have done
D must have done
A an old square wooden table
B a square wooden old table
C a square old wooden table
D an old wooden square table
A whose sick sister
B whose sister sicked
C who his sister is sick
D whose sister was sick
A No sooner
B Only
C Not until
D Just before
A in terms of
B with a view to
C regardless
D on behalf of
A extinction .
B biodiversity
C habitat
D conservation
A Really? They are
B Thank you, it is nice of you to say so
C Can you say it again
D I love them, too
A therefore
B although
C unless
D despite
A mistakes
B faults
C fouls
D errors
A after
B cross
C away
D out
A attends
B attend
C has attended
D attended
A lose touch with
B make room for
C pay attention to
D take notice of
A mustn’t
B needn’t
C mightn’t
D may not
A discarded
B accompanied
C performed
D played
A to lose leaves
B that the loss of leaves
C the leaves are lost
D when leaves have lost
A electric
B electricity
C electrical
D electrify
A complicated
B worldly
C experienced
D aware
A every single day
B every other day
C every second day
D every two days
A using gesture
B using speech
C using verbs
D using facial expressions
A dropped
B removed
C kicked
D tossed
A circulated
B transmitted
C conveyed
D submitted
A as
B entertainment
C its
D or
A Of
B best
C by
D covering
A not
B sold
C best
D the
A Because
B he
C take
D held
A my new
B strangely
C got used
D in the end
A govern all the body’s responses.
B regulate the body’s functions.
C help us sleep
D help us adapt to a 24-hour cycle
A the programme
B the body clock
C the function
D the brain
A makes our body clock operate badly.
B causes our body clock to change.
C extends the hours of our body clock.
D upsets our body’s rhythms.
A helps you sleep better.
B alters your body’s natural rhythms.
C affects the degree of jet lag.
D extends or shrinks your body clock.
A various factors stop us sleeping when we fly.
B travelers complain about the negative effects of flying.
C flying seriously affects your judgment and decision-making.
D jet lag can affect different abilities differently
A makes no suggestions.
B says there is nothing you can do.
C proposes gradually adjusting your body clock.
D suggests changing the time on your watch.
A Travelers try to sleep between 3-5 p.m.
B Travelers’ attention is reduced by 75 percent.
C The traveler’s internal circadian clock has to adjust to patterns of light and activity.
D Travelers fly in the natural direction of their internal clock
A travelers have to spend more money flying westward than eastward.
B there are more travelers in westward flights than in eastward ones.
C westward travelers become friendlier than eastward ones.
D travelers do not sleep as well in eastward flights as in westward ones.
A obsession
B exhaustion
C sleeplessness
D frustration
A one of the most important properties of metals
B one of the key properties of most solid materials
C impossible for any substance when it is dissolved in water
D completely impossible for silicon
A the absence of free electrons
B its atoms with a positive charge
C the way its atoms bond together
D the loss of one electron in the core of its atoms
A the lightest
B nearest to the inside
C furthest from the inside
D the heaviest
A the lost electrons cannot move freely in the sea of electrons
B electrons can flow in a single direction
C they lose all of electrons
D negatively charged electrons attract positive ions
A it has free electrons
B its charged ions can flow easily
C it cannot create any charge ions
D it charged ions are not free to move
A charged ions
B electric currents
C charged particles
D electrical insulator
A no positive or negative electric charge
B only a small amount of fully charged particles
C only a positive electric charge
D only a negative electric charge
A the eater itself is a good conductor of electricity
B the water dissolves the salt on our skin and becomes more conductive
C the water contains too many neutral molecules
D the water containing no charged particles makes it more conductive
A . Pure water is much more conductive than most water we encounter every day.
B Graphite is a common solid substance that can conduct electricity.
C Salt can conduct electricity when it is molten or dissolved.
D Some materials are more conductive than others.
A Electrical Energy
B Electrical Devices
C Electrical Insulators
D Electrical Conductivity
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