.It' s quite a time ______Yao Ming got injured, but it won' t be long________he returns to
the court.
| A．since;before | B．after; when | C．before;since | D．that; when |
It was not until all the milu deer ________ that we realized we should build a natural park to protect them.
| A．died off | B．died away | C．died out | D．died down |
Do you remember a certain occasion ________ you were in trouble and at that moment I gave you a hand.
| A．when | B．which | C．why | D．where |
You may catch up with others__________you work a little harder.
| A．so long as | B．so far as | C．however | D．unless |
__________ the students are doing their maths exercises with the help of the teacher.
| A．Three score of | B．Three scores |
| C．Score of | D．Scores |
---- ______was it______ you discovered the secret of his?
-----Totally by chance .
| A．How; that | B．How; when | C．What; that | D．What; when |