In the daytime it is very ___________ on the moon, but it is very ___________ at night.

1. A.
   hot, cool
2. B.
   hot, cold
3. C.
   hot, colder
4. D.
   cool, hot

In the daytime it is very ___________ on the moon, but it is very ___________ at night.　　　

[　　]

A． hot, cool　　　　　　　　B． hot, cold

C． hot, colder　　　　　　　D． cool, hot

The stars _________ in the daytime．

1. A.
   mustn't see
2. B.
   can't see
3. C.
   mustn't be see
4. D.
   can't be seen

We work ________ the daytime and sleep ________ night．

1. A.
   in, on
2. B.
   at, at
3. C.
   on, at
4. D.
   in, at