He made a mistake, but he corrected the situation __________ it got worse.
| A．until | B．when | C．before | D．as |
He decided to _________ the club for old men and play chess there.
| A．take part in | B．join in | C．attend | D．join |
According a recent report, there are _________ to be 1.35 billion people in China in 2017.
| A．decided | B．determined | C．reported | D．estimated |
In the old days, some wealthy people killed animals just for the ______ of it.
| A．joy | B．pleasure | C．fun | D．play |
Xiao Li was about to cheat in the exam ________ the teacher came up, smiling to him.
| A．as | B．when | C．while | D．until |
You can find me easily, for there is only one house _______ roof is flat.
| A．whose | B．of which | C．of that | D．that |