--Would you like____football with us? --Of course. I enjoy____ football very much.
| A．to play; play | B．playing; to play |
| C．to play; playing | D．play; playing. |
—Does your father still smoke?
—No, he has succeeded in_____ smoking for three years.
| A．giving up | B．give up | C．gives up | D．gave up |
—How do you like Beijing, Miss Read?
—I’ve no idea. I _____ there.
| A．have been | B．haven’t been to |
| C．haven’t been | D．have been to |
—Where are Maria and Kangkang?
—They _____ England.
| A．have been to | B．are away | C．have gone to | D．had been in |
—Have you found your lost book_____?
—No, I haven’t.
| A．already | B．yet | C．still | D．once |
The _____ population has caused many serious problems.
| A．increase | B．increased | C．increasing | D．increases |