–Should I keep what we talked about just now secret from Sofia?
--She is our close friend, and deserves ____ the truth.
| A．knowing | B．know | C．to know | D．to be known |
Not until they left school how much their teachers loved them and helped them.
| A．they realized | B．did they realize |
| C．had they realized | D．they would realize |
This new kind of chemicals will help keep the air, soil and water________ from pollution.
| A．free | B．empty | C．loose | D．short |
---I have cleaned the room three times a day. Look, It is a mess again.
---! Wait until the children go to bed.
| A．How come | B．Why bother | C．So what | D．What for |
Not for a moment ______ sightseeing while in Europe.
| A．has he stopped | B．he stops | C．did he stop | D．he did stop |
He ______be lazy, but he can work hard when he feels like it．
| A．may | B．will | C．should | D．must |