$44.A$

$45.C$

$46.A$

$47.D$

$48.B$

$49.C$

$50.D$

$III$

1.$\text{ will be having}$

2. $\text{will you be doing}$

3. $\text{will be studying}$

4. $\text{will not be waiting}$

5.$/text{will be walking}$

6.$\text{Will Dereck be playing}$

7.$\text{will be doing}$

8.$\text{Will we be visiting}$

9.$\text{ will not be swimming}$

10. $\text{Will you be going}$

$IV$

1.$\text{ will be studying}$

2.$\text{ will replace}$

3. $\text{won’t be using}$

4.$\text{ will be attending}$

5. $\text{will happen}$

6.$\text{ won’t be calling}$

7.$\text{ won’t shopping}$

8. $\text{will find}$

9. $\text{will be working}$

10. $\text{Will solar energy be replacing}$

$V$

1. $\text{Coal is more expensive and more polluting than natural gas.}$

2. $\text{We are looking for cheap and clean and effective source of energy.}$

3. $\text{Will fossil fuels be replaced by solar and wind within 20 years?}$

4.$\text{ I have visited Yaly hydroelectric power plant once before.}$

5. $\text{The first hydroelectric power plant was built in Niagara Falls by them in 1879.}$

6.$\text{ You should switch off electrical appliances when they aren’t in use.}$

7.$\text{ Despite being the most polluting of fossil fuels, coal is still the largest sources of energy worldwide.}$

8. $\text{People will use biogas for fuel in homes and for transport.}$

$VI$

1. $\text{Harry is a friend of mine}$

2. $\text{It was their idea.}$

3.$\text{ This house is ours.}$

5.$\text{ She is talking to a neighbor of hers.}$

6. $\text{His car is the red one.}$

7. $\text{Is that house theirs?}$

8. $\text{That is your cup.}$

xin hay nhất

III

1, will be having

2, will you be doing

3, will be studying

4, will not be waiting

5, will be walking

6, Will Dereck be playing

7, will be doing

8, Will we be visiting

9, will not be swimming

10, Will you be going

IV

1, will be studying

2, will replace

3, won’t be using

4, will be attending

5, will happen

6, won’t be calling

7, won’t shopping

8, will find

9, will be working

10, Will solar energy be replacing

V

1, Coal is more expensive and more polluting than natural gas.

2, We are looking for cheap and clean and effective source of energy.

3, Will fossil fuels be replaced by solar and wind within 20 years?

4, I have visited Yaly hydroelectric power plant once before.

5, The first hydroelectric power plant was built in Niagara Falls by them in 1879.

6, You should switch off electrical appliances when they aren’t in use.

7, Despite being the most polluting of fossil fuels, coal is still the largest sources of energy worldwide.

8, People will use biogas for fuel in homes and for transport.

VI

1, Harry is a friend of mine.

2, It was their idea.

3, This house is ours.

4, This is my pencil, but where’s yours?

5, She is talking to a neighbor of hers.

6, His car is the red one.

7, Is that house theirs?

8, That is your cup.