is known to us is that the 2016 Olympic Games will be held in Rio de Janeiro, Brazil.
| A．It | B．Which | C．As | D．What |
Not until actually ____ with water shortage ____ appreciate the value of water to a region.
| A．facing; one can | B．faced; can one |
| C．faced; one cannot | D．facing; cannot one |
---Thanks a lot for your offer. I found it very helpful.
---____. I’m glad you benefited from it.
| A．All the best | B．No thanks |
| C．It is nothing | D．Very well |
--- Shall I go over to have a chat with you this evening?
--- Nice of you! It is ____ great comfort to keep me ____ company, when I’m alone at home.
| A．a; the | B．/ ; a |
| C．a; / | D．the ; / |
At the age of 29, Dave was a worker, _______ in a small apartment near Boston and ______ what to do about his future.
| A．living; wondering | B．lived; wondering |
| C．lived; wondered | D．living; wondered |
When he ______the door, he found his keys were nowhere.
| A．would open | B．opened |
| C．had opened | D．was to open |