One more month，______these baby birds will fly out of their nest.
| A．or | B．and | C．but | D．otherwise |
Gun control is a subject ______Americans have argued for a long time.
| A．of which | B．with which | C．about which | D．into which |
The astronauts found that ______ the spaceship went further and further into space, it became more and more difficult to control its own movements.
| A．if | B．till | C．as | D．while |
You shouldn’t talk until ________ to.
| A．asking | B．having asked | C．to ask | D．asked |
When I woke up, I found myself ______ in bed and ______ by doctors and nurses.
| A．lying; surrounding | B．laying; surrounded |
| C．lain; surrounding | D．lying; surrounded |
----- I’ ll give you a ring about eight.
------ Could you phone a bit later? I ______ dinner then.
| A．will be having | B．have had | C．had | D．was having |