______ their service, the workers of the hotel are active in learning English.
| A．Improving | B．To improve |
| C．Improve | D．Having improved |
You’d better not leave the medicine ______ kids can get at it.
| A．even if | B．which | C．where | D．so that |
He found it increasingly difficult to read, ______ his eyesight was beginning to fail.
| A．though | B．for | C．but | D．so |
31. -----Do you have a minute? I’ve got something to tell you.
-----Ok, ______ you make it short.
| A．now that | B．if only | C．so long as | D．every time |
I’m sorry you’ve been waiting so long, but it’ll still be some time ____ Brian get back.
| A．before | B．since | C．till | D．after |
—Have you got any idea for the summer vacation?
—I don’t mind where we go ______ there’s sun, sea and beach.
| A．as if | B．as long as | C．now that | D．in order that |