Teaching is a difficult job ______ requires great skill and patience．
| A．which | B．where |
| C．who | D．why |
If Tom _____ my advice, he wouldn't have lost his job．
| A．should follow | B．had followed |
| C．followed | D．would follow |
While _____ to foreigners, you must try to make yourself _____ by using body language if necessary．
| A．speaking? understand | B．spoken; understand |
| C．speaking; understood | D．spoken; understood |
—Wow, so many books here! How can you find the one I need?
—Yhat’s easy．The books are _____ by subject．
| A．djudged | B．remarked |
| C．classified | D．furnished |
—What sort of house do you want to have? Something big?
—Well, it _____ be really huge梥ize isn't so important．
| A．needn't | B．mustn't | C．can't | D．won't |
Rain is pouring down from the sky without any sign of stopping．Farmers begin to worry about their crops since it _____ as long as 24 hours．
| A．would rain | B．had rained | C．was raining | D．has been raining |