Don’t leave the water ______ while you brush your teeth.
| A．run | B．running | C．being run | D．to run |
---- Do you mind my taking this seat?
---- ____.
| A．Yes, sit down please | B．No, of course not |
| C．Yes, take it please | D．No, you can’t take it |
It was not until 1920 ____ regular radio broadcast began.
| A．while | B．which | C．that | D．since |
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 |
____ is a fact that English is being accepted as an international language.
| A．There | B．This | C．That | D．It |
If you go to Xi’an, you’ll find the palaces there more magnificent than commonly ____.
| A．supposing | B．suppose | C．to suppose | D．supposed |