A. trust
B. surf
C. order
D. prove
A. spot
B. place
C. dump
D. site
A. dropping
B. dripping
C. falling
D. wasting
A. volume
B. tone
C. sound
D. track
A. replaced
B. captured
C. gathered
D. located
A. collect
B. to collect
C. collecting
D. collected
A. Yes, can I help you?
B. Don’t mention it.
C. Thanks! Same to you.
D. That’s very kind. Thank you.
A. these are
B. which are
C. they are
D. that are
A. ran
B. was running
C. has run
D. had run
A. about
B. on
C. with
D. in
A. Pedestrians in the road
B. Zebra crossing
C. Children going to or from school
D. No pedestrians
A. Slow down to no more than 15 mph because a school zone is ahead
B. Slow down for an upcoming school zone but go no lower than 15 mph
C. Slow down only if you see children playing
D. Continue driving at your current speed but watch out for children
A. people living in the country.
B. people who recycle.
C. 50% of the world’s population.
D. people in developing countries
A. It was expensive.
B. It couldn’t operate cars.
C. It caused pollution.
D. It had to be placed on high buildings.
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