There was no sign _______ they had died from diseases such as bird flu - the main worry in such cases. Among the theories was _______ a truck had collided(碰撞)with the crowd.
I am quite sure that Mr. Smith will take up his story ___ he stopped yesterday.
–What is the theme about for the meeting this evening?. --No idea. Perhaps we will have to discuss the plan ___ a few days later.
Whenever a patient needs an injection of Penicillin, the doctor does need to make sure whether his patient is ___ to the medicine.
With all the food supply ___, the researchers had to put an end to the wildlife protection project and returned home.
I was not hearing to the teacher, or else I ___ his questions.A. answered B. had answered C. would have answered C. have answered