Eating too much fat can _______ heart disease and cause high blood pressure. Which of the following is not correct?
| A．lead to | B．result from |
| C．contribute to | D．bring about |
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 |
Some hard-working students always keep a torch in their dormitories _____ there is a power failure.
| A．if | B．unless | C．so that | D．in case |