I coutdn't have got to the meeting on time____________ an earlier train.
| A．if I had not caught | B．unless I had caught |
| C．if ! did not catch | D．unless I caught |
What some Chinese parents understand is that nothing is fun _______ their children are fond of it.
| A．after | B．when | C．if | D．unless |
The owner of the jewelry store says a(n) _______ of $ 1,000 will be offered to anyone who can find the lost jewels.
| A．income | B．reward | C．bonus | D．fee |
— Can I come to ask for some advice at any time?
—Yes, of course. ___________ .
| A．If you're convenient | B．At your convenience |
| C．Don't worry | D．Don't mention it |
The stronger the _____is, the more quickly a man will learn a new skill. In other words, it is up to whether he has an interest in it.
| A．ambition | B．inspiration | C．aspiration | D．motivation |
Reading ___the lines, we can get the message _ they are worried about their son.
| A．between; that | B．behind ; that | C．along; what | D．among; which |