When you read the book, you' d better make a mark _____ you have any questions.
| A．at which | B．at where |
| C．the place | D．where |
Much attention should be paid _______ the wild animals as many of them are dying out.
| A．protect | B．to protect | C．protecting | D．to protecting |
It is not rare in _______ that people at the age of forty are going to _________university for further education.
| A．90s; the | B．the 90s ; / | C．90s; a | D．the 90s; the |
There is a popular opinion among teachers _____ reviewing the lesson after class can help students learn better.
| A．who | B．whose | C．that | D．which |
Why not __ your new ideas? Otherwise you will never know whether they are possible or not.
| A．put out | B．wear out | C．try out | D．find out |
He is _____ to staying up and getting up late, which is a bad habbit。
| A．accustomed | B．Appointed | C．applied | D．exposed |