______is known to us, he is the top student of our class.
| A．It | B．As | C．This | D．That |
A society was set up to __________ the endangered animals and plant life from dying out in this area.
| A．reserve | B．preserve |
| C．observe | D．deserve |
A number of students _______ said they were forced to practice the piano.
| A．to question | B．to be questioned |
| C．questioned | D．questioning |
---- Can I sit in the front row?
----Yes, you can take ________ seat you like.
| A．whatever | B．what |
| C．whichever | D．which |
Its hard to ________ the green beans from the red ones, because there are too many of them.
| A．work out | B．watch out |
| C．sort out | D．set out |
Never before _______ seen anybody who can play tennis as well as Robert.
| A．had she | B．she had |
| C．has she | D．she has |