. The man is said to have worked as a spy in the s, when he ____ information for the government.
| A．was gathered | B．gathered | C．had gathered | D．has gathered |
When _______ homework , you should be careful .
| A．do | B． to do | C．doing | D． done |
_______ the news, they are very happy.
| A．Hearing | B．Heard | C．Hear | D． To hear |
We last night, but we went to the party instead.
| A．must have studied | B．might study | C．should have studied | D．would study |
The reason_______ he didn’t come was that he was injured.
| A．that | B．why | C．because | D．when |
There is no doubt _________ the world climate has been changing in recent years.
| A．that | B．what | C．if | D．whether |