On Sundays there were a lot of children playing in the park, ____ parents seated together joking.
| A．whose | B．their | C．which | D．where |
------Excuse me, Sir , shall all the students repeat the exam.
------________. Only those who failed.
| A．That’s right . | B．I’m afraid not . | C．Yes, of course. | D．I’m not sure. |
------Make sure you have turned off the air conditioners before going out.
------________________.
| A．Heard it | B．Made it | C．Forgot it | D．Got it |
He was about to tell me the secret ＿＿ someone patted him on the shoulder.
| A．as | B．until | C．while | D．when |
He is the only one of the students who ＿＿ a winner of three years.
| A．is | B．are | C．have been | D．has |
The scientist did ＿＿ experiments to test the new drug.
| A．a series of | B．a good many of | C．a great many | D．a lots of |