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 |
You can come here to ask me _____ if you have any questions.
| A．at one time | B．at your time | C．at any time | D．all the time |
Having a trip abroad is certainly good for the old couple, but it remains ______ whether they will enjoy it.
| A．to see | B．to be seen | C．seeing | D．see |
Tom will succeed _____ your property after your death,but I don’t think he is_________success.
| A．in, / | B．at , a | C．to , a | D．from, a |
—What do you think of seven o’clock outside the cinema this evening?
—That _______ me fine.
| A．fits | B．meets | C．satisfies | D．suits |
He’s got himself into a dangerous situation ________ he is likely to lose control over the plane.
| A．where | B．which | C．while | D．why |