New technology ______ to make sure that the cars, taxis, buses and trains we use ______ the air.
| A．is used; not to pollute | B．has used; is not polluted |
| C．is being used; do not pollute | D．has been used; to pollute |
Come early, _____ you’ll miss the film.
| A．or else | B．else | C．however | D．and otherwise |
.It is often said that an American starts speech with a joke, __ a Japanese has an apology to make.
| A．as | B．when | C．which | D．while |
.I had a discussion with Mr.Baker and hoped he _________ us an early reply.
| A．would give | B．give | C．gave | D．had gives |
All those _________ to go to the football match please raise your hands.
| A．will wish | B．wish | C．wishing | D．wished |
.It was a cold winter night,and there wasn’t anyone _________ the boy could turn to for help in the street.
| A．that | B．which | C．whom | D．what |