Pag. 32 es. 1

1. D
2. E
3. C
4. A
5. B

es. 2

1. It was flying to the moon
2. There has been an explosion
3. The NASA engineers and the Apollo 13 crew did
4. 6 days

es. 3

1. B
2. C
3. B
4. C
5. A
6. D

es. 4

2. came up with
3. figure out
4. carrying out
5. breath a sigh of relief
6. running out
7. cheer
8. on duty

es. 5

1. running out
2. carried out
3. hatch
4. on duty
5. breathed a sigh of relief
6. cheered
7. came up

es. 6

I agree with the third one: I think that it's worth spending some money to get rid of important questions like these.

es. 7

2. fix a problem
3. follow events
4. get crazy
5. go home
6. raise your hands

Pag. 43 es. 1

1. Cars are much more fast nowadays.
2. Keyboards aren't that noisy anymore and are easier to use.
3. You can now take your telephone with you and it has a lot more functions.
4. Photo are now digital, which makes them a lot more durable and easy to store.

es. 2

1. T
2. F
3. F
4. T
5. T
6. T

es. 3

1. used to have
2. used to phone
3. bought

es. 4

2. didn't use to use - drive
3. update - used to write
4. play - used to play
5. used to suggest - give out
6. used to watch - watch
7. use - used to look up
8. didn't use to worry - give

es. 5

1. used to
2. didn't use to go
3. /
4. didn't use to like
5. /
6. /