You mustn’t drive _____ you have drunk.
| A．although | B．if | C．before | D．unless |
Research _____________ that men find it easier to give up smoking than women．
You _____ be 18 years old before you are allowed to drive a car ,and it’s also essential to get a driver’s license
| A．could | B．may | C．can | D．have to |
To be qualified for the job , _________
| A．ir is required that one has profound knowledge |
| B．profound knowledge is important |
| C．profound knowledge is a must |
| D．one needs to have profound knowledge |
I gave his book to read, but after a page or two he would put _______book down and pick up _________new one．
| A．a; the | B．the; 不填 | C．the; a | D．a; a |
Under good treatment, Linda is beginning to ______and will soon recover ．
| A．pick up | B．wake up | C．grow up | D．show up |