I ______the paper before my lawyer explained the details to me.
| A．signed | B．had signed |
| C．signs | D．has signed |
. In our class, when the bell rang and the teacher closed his book, it was a______for everyone to stand up.
| A．mark | B．chance | C．signal | D．measure |
Now, in our country free medical treatment covers sickness of mind as well as ______sickness.
A. o
rdinary B. average C. regular D. normal
The biggest whale is ______ blue whale, which grows to be about 29 meters long—the height of ______ 9-story building.
| A．the; the | B．the; a | C．a; the | D．a; a |
— You should apologize to her, Barry.
—______, but it’s not going to be easy.
| A．I suppose so | B．I feel so | C．I do so | D．I like to |
Gun control is a subject______Americans have argued for a long time .
| A．of which | B．with which |
| C．into which | D．aboutwhich |