Doctors always tell us that drinking too much________our health，but some people don’t care.
| A．is harm to | B．does harmful to |
| C．is harmful to | D．do harm to |
It was about 600 years ago _____ the first clock with a face and an hour hand was made .
| A．that | B．until | C．before | D．when |
—Which of these two electronic dictionaries do you like better ?
—_____ . They are both expensive and of little use .
| A．Neither | B．All | C．Both | D．None |
The weather turned out to be very good ,_____ was more than we could expect .
| A．what | B．which | C．that | D．it |
What you should remember is that we should always keep____ in an emergency .
| A．still | B．calm | C．quiet | D．silent |
Please___ all the numbers . Those numbers_____ 10,000.
| A．add to ; add up | B．add up ; add up to | C．add ; add to | D．add up to ; adds |