Surfing the Internet is ___ a kind of relaxation, ____ our knowledge.
| A．not more than; adds | B．more than; adding to |
| C．no more than; adding to | D．more than; adds up to |
Luckily good things _________ here to save local wildlife.
| A．are doing | B．are being done |
| C．had been done | D．will do |
The earth became so violent that it was not clear_________ the shape would last or not.
| A．if | B．how | C．whether | D．why |
__________ she couldn’t understand was _________ fewer and fewer students showed interest in her lessons.
| A．What; why | B．That; what | C．What; because | D．Why; that |
The clever boy made a hole in the wall, ________ he could see what was going on inside the building.
| A．on which | B．at which | C．through which | D．in which |
—What sort of house do you want to have? Something big?
—Well, it _______ be big—that’s not important. But it _________ have a nice garden—that’s important for me.
| A．mustn’t; need | B．needn’t; must |
| C．couldn’t; need | D．shouldn’t; must |