He asked where she ____, but she didn’t respond.
| A．had been | B．was | C．has been | D．is |
—I am going to travel to America．Would you consider telling me about your experiences there?
—__．Let's discuss it over dinner．
| A．That's all right | B．Go ahead |
| C．By all means | D．It just depends |
I don't think the experiment is ___ failure, because it has provided us with ___valuable experience for our future tests.
| A．不填; 不填 | B．不填; a | C．a; a | D．a; 不填 |
---I’m sorry! I would have taken him to hospital if I had known he was seriously ill.
--- But ______ .
| A．you didn't | B．you hadn't | C．he wasn't | D．you aren't |
Rock-climbing is a breathtaking activity, very popular nationwide among young people, ______ cooperation as well as courage plays an important role.
| A．who | B．which | C．where | D．of which |
A housing bubble is an economic situation _____ occurs when house prices rise much too fast.
| A．which | B．where | C．what | D．why |