People in industrial countries take in _________as they actually need every day.
| A．twice as much protein | B．protein as much twice |
| C．twice protein as much | D．protein as twice as much |
I think you should end it _______ it’s too late, or you may be sorry about it later.
| A．after | B．when | C．until | D．before |
The doctor could ______ by the symptom that the patient caught flu.
| A．observe | B．say | C．tell | D．speak |
I can’t stand ________ with Jane in the same office. She just refuses _______ talking while she works.
| A．working ; stopping | B．to work ; stopping |
| C．working ; to stop | D．to work ; to stop |
I’m considering _______ a washing machine, which is considered ________ a great help to my wife.
| A．buying ; to be | B．buying ; being | C．to buy ; being | D．to buy ; to be |
By the time he was twelve, Edison ________ to make a living by himself .
| A．would begin | B．has begun | C．had begun | D．was begun |