More and more people would like to live in the countryside ______ the air is fresher and the price of housing is lower.
| A．that | B．where | C．which | D．for which |
You can keep the book until you ______ .
| A．have finished reading | B．finish to read |
| C．will finish reading | D．have finished to read |
You'll regret ______ those words. You may hurt her feelings.
| A．say | B．to say | C．having said | D．to have said |
Though he failed, he tried _______ it again and again.
| A．to do | B．doing | C．do | D．done. |
You didn't hear us come back last night. That's good. We tried ______ noisy.
| A．to not be | B．not to be | C．being not | D．not being |
Remember ______ the book, when you have finished it.
| A．putting back | B．having put back | C．to put back | D．will put back |