I really appreciate your________ to help me with my maths, but I’m afraid that I have no time this week.
| A．offered | B．to offer |
| C．offering | D．offer |
14.Many people now make_________a rule to buy cards for their friends before Christmas.
| A．themselves | B．it | C．that | D．This |
15.__________is very clear to everyone that he's round and tall like a tree.
16.
| A．This | B．What | C．That | D．It |
17..In the United States, bus travel doesn't cost much as train travel, ?
18.
| A．don't they | B．does it | C．do they | D．doesn't it |
19..Someone is at the door, who is_________?
20.
| A．this | B．that | C．it | D．He |
21.—It is raining cats and dogs.
22. — ..
23.
| A．So it is | B．So is it | C．Neither it is | D．Neither is it |