I can still remember that it is since the 1990’s, _____ we began to use cell phones,_______ the number of mobile users has greatly increased．
| A．while; when | B．when; what | C．before; that | D．when; that |
The bridge, which _________ 1688, needs repairing.
| A．is dated from | B．was dated from | C．dates from | D．dated from |
He has changed a lot. He _________ not what he _________.
| A．is, is | B．was, was | C．is, was | D．was, is |
Mr Smith _________ a book about China last year but I don’t know whether he has finished it.
| A．has written | B．wrote | C．had written | D．was writing |
Dear me! Just _________ at the time! I _________ no idea it was so late.
| A．look, have | B．looking, had | C．look, had | D．looking, have |
“I _________ his telephone number.” “I have his number, but I _________ to bring my phone book.”
| A．forget, forget | B．forgot, forgot | C．forget, forgot | D．forgot, forget |