——Why on earth didn’t you answer the phone?
——I’m terribly sorry, but the doorbell ____ , too.
| A．is ringing | B．rang | C．was ringing | D．was about to ring |
The report was not concrete and in a way lacked persuasion, but ______, I felt it is fair.
| A．above all | B．in others words | C．on the whole | D．on average |
Many things ______ impossible in the past are very common today.
| A．consider | B．considering | C．considered | D．are considered |
She is believed______ the train, otherwise she would have arrived here by now.
| A．to miss | B．to have missed | C．to be missed | D．to be missing |
Scientists say it may be five or six years ______ it is possible to test this medicine on human
patients.
| A．since | B．after | C．before | D．when |
The victims of the accident demanded that the case ______ at once.
| A．would be looked into | B．should look into |
| C．be looked into | D．look into |