Part 1

1. more

2. didn't

3. however

4. if

5. less

6. which

Part 2

1 - E

2 - A

3 - B

4 - F

5 - C

6 - D

Part 3

1. plays

2. have printed

3. be obeyed

4. to donate

5. for a picnic

6. beautifully

7. safety

8. unpolluted

Part 4

1. has -> had

2. good -> better

Part 5

1. why I wanted

2. didn't have free time

3. will be brought

4. who sings very well

Part 6

1. of

2. economic

3. sooner

4. exhausted

Part 7

1. F

2. T

3. F

Bài 1:

1.more   2.didn't   3.however

4.if   5.less   6.which

Bài 2:

1.E  2.A  3.B

4.F  5.C  6.D

Bài 3:

1.plays

2.have printed

3.be obeyed

4.to donate

5.for a picnic

6.bbeautifully

7.ssafety

8.unpolluted

Bài 4:

1. has -> had

2. good -> better

Bài 5:

1. why I wanted

2. didn't have free time

3. will be brought

4. who sings very well

Bài 6:

1.of   2.economic

3.sooner   4.exhausted

Bài 7:

1.F  2.T  3.F