He spent every minute he could _____ spoken English.
| A．practise | B．to practise |
| C．practising | D．practised |
The country's railway system has launched online ticket-booking and a real-name ticket purchasing system, and _______ requires passengers to provide their ID numbers when buying tickets.
| A．which | B．that | C．what | D．this |
—Have you been working in N0.5 Middle School since you graduated from college?
~No, I _______ in the countryside for 3 years.
| A．have taught | B．had taught |
| C．have been teaching | D．taught |
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 |