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 |
In this experiment, they are woken up several times during the night, and asked to report what they _____.
| A．had just been dreaming | B．are just dreaming |
| C．have just been dreaming | D．had just dreamt |
When he was alive, the old scientist used to say that knowledge ____ from practice and he gained his experience by doing a lot of practical work.
| A．was coming | B．had come | C．comes | D．would come |
She _____ to the office than she got down to writing the report.
| A．has no sooner got | B．had hardly got | C．no sooner got | D．had no sooner got |
He _____ articles for our wall-newspaper these three years, and he _____ about forty articles.
| A．has been writing； has written | B．has been writing； wrote |
| C．is writing； has been writing | D．has written； has written |
— Look at the black clouds. It ____ soon.
— Sure. If only we ____ out.
| A．is raining； didn’t come | B．is to rain； won’t start |
| C．will rain； haven’t started | D．is going to rain； hadn’t come |