----What ________ the number of the students in your school?
---- About two thousand. A number of them _______ from America.
| A．is; are | B．is; is | C．are; is | D．are; are |
Willie will learn swimming, no matter how much it ____.
| A．costs | B．takes | C．spends | D．pays |
---May I use your dictionary?
---_____.
| A．Never mind | B．You are welcome | C．It doesn’t matter | D．Certainly. Here you are |
He was so tired that he fell asleep ___he went to bed.
| A．as if | B．even though | C．ever since | D．as soon as |
Last Thursday when I got to the airport, I ____I had left my ticket at home.
| A．forgot | B．realized | C．believed | D．seemed |
There are two new buildings near the sea, and ____of them are very tall.
| A．none | B．all | C．neither | D．both |