So suddenly ________that the animals in the zoo looked very frightened during the total solar eclipse (日全食)．
| A．did the sky turn dark | B．the sky did turn dark |
| C．turned the sky dark | D．was the sky turned dark |
You are hardworking and surely most of you _____ a college admission notice by the end of September this year.
| A．will receive | B．will be receiving |
| C．will be received | D．will have received |
I _____ through the hard time but for my teacher’s generous and timely help.
| A．couldn’t have gone | B．could go |
| C．mustn’t have gone | D．hadn’t gone |
The class teacher was anxious to hear one of his top students _____ because of family move.
| A．will leave | B．is leaving |
| C．was leaving | D．has left |
With the exam ______ in ten minutes, they were asked to hand in their mobile phones.
| A．taken place | B．taking place |
| C．having taken place | D．to take place |
More than one doctor _____ involved in the rescue that took place after the earthquake.
| A．was | B．is | C．were | D．are |