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ex. 1

1. D

2. E

3. C

4. A

5. B

ex. 2

1. It was flying to the Moon.

2. It didn't get here because there were problems during the mission.

3. The NASA engineers helped to solve the problem.

4. They spent in space 4 days in total.

ex. 3

1. B

2. A

3. B

4. C

5. D

6. C

ex. 4

1. hatch

2. came up with a plan

3. figure out

4. on duty

5. breathe a sigh of relief

6. running out

7. cheer

8. carrying out

ex. 5

1. figured out

2. running out

3. carrying out

4. hatch

5. on duty

6. cheer

7. breathe a sigh of relief

8. came up with a plan

ex. 6

• I'm not agree;

• I'm agree;

• I'm agree.

ex. 7

1. find a solution

2. fix a problem

3. follow events

4. get home

5. go crazy

6. raise your hand

page 34

ex. 1

ex. 2

1. T

2. F

3. T

4. F

5. F

6. T

ex. 3

1. used to

2. used to

3. bought

ex. 4

2. didn't use to – drive

3. update – used to

4. play – used to

5. used to suggest – give out

6. used to – watch

7. use – used to look up

8. didn't use to be worry – give

ex. 5

1. used to take

2. didn't use to go

3. X

4. didn't use to like

5. X

6. X

ex. 6

1. A: Did your parents use to take you to school?

B: Yes, they did.

2. A: Did you use to go online?

B: No, I didn't.

4. A: Did you use to like school dinners.

B: No, I didn't.