My friend, David, was not used __________ by air, so he felt unwell.
| A．to traveling | B．to travel | C．traveling | D．travel |
When is the best time to ____ my employer about an increase in salary?
| A．appeal | B．appreciate | C．applaud | D．approach |
The book was received so eagerly that it _____ on the first day.
| A．sold up | B．was sold up | C．was sold out | D．sold out |
-----Where ____ you put the ruler? I can't see it anywhere.
-----I put it right here. But now it is ____.
| A．have, gone | B．did, missed | C．had ,going | D．will, missing |
Happy birthday , Alice ! So you have____twenty-one already !
| A．become | B．turned | C．grown | D．passed |
It is _____world of wonders,____ world where anything can happen.
| A．a ;the | B．a; a | C．the ; a | D．不填；不填 |