________ your composition carefully, some spelling mistakes can be avoided.
| A．Having checked | B．Checking | C．If you check | D．To check |
---He ought to have been warned of the danger.
---_______, but he wouldn’t listen to me.
| A．He did | B．He should | C．He ought to | D．He was |
---You may find the key to the maths problem on page 107.
---Ah, it’s so simple. I wonder why I ________ of that.
| A．didn’t think | B．haven’t thought | C．wasn’t thinking | D．hadn’t thought |
----You seem to have known Dr Smith for a long time.
---- That’s true. ______ he joined our club six years ago.
| A．Since | B．Until | C．When | D．Before |
----I don’t mind telling you what I know.
----You ________. I’m not asking you for it.
| A．mustn’t | B．needn’t | C．may not | D．shouldn’t |
The Mid-Autumn Day, which is a day for family reunion in China, _____ on September 12th this year.
| A．falls | B．fixes | C．lies | D．sets |