I won't tell the student the answer to the math problem until he on it for more than an hour.
| A．has been working | B．will have worked |
| C．will have been working | D．had worked |
.You can have _________ second try if you fail______ driving test this time.
| A．the; a | B．the; the | C．a; the | D．a;/ |
---How long are you staying?
---I don’t know. ___________.
| A．That’s OK. | B．Never mind | C．It depends | D．It doesn’t matter |
Parents shouldn’t be too ______________ towards their children; they should let them be more independent.
| A．genuine | B．protective | C．close | D．outspoken |
________ he is well again, he can go on with his English study.
| A．Ever since | B．Now that | C．So that | D．As if |
This is not an economical way to get more water; _________,it is very expensive.
| A．on the contrary | B．on the other hand | C．in a word | D．rather than |