David couldn't tell __________ from far away whether the green traffic light meant going straight or turning left.
| A．on purpose |
| B．at random |
| C．in short |
| D．for sure |
Clinical evidence began to ______ suggesting that the new drugs had a wider range of useful effect than had been predicted from experiments in animals.
| A．operate. | B．strengthen | C．accumulate | D．approve |
The terrible earthquake took place early this month ______ three southern countries meet.
| A．where | B．when | C．that | D．which |
It is an abundance of cheap goods and quick delivery service ______ account for the fact that the number of Internet shopping on this website is four times ______ it was last year.
| A．that; that | B．which; what | C．what; that | D．that; what |
— Can Jeremy Lin lead New York Knicks to win the next game?
— Out of the question now. He ______ to do so, but he has just hurt his leg.
| A．would expect | B．has expected | C．was expected | D．is expected |
Mary ______ my letter; otherwise she would have replied before now.
| A．has received |
| B．ought to have received |
| C．couldn’t have received |
| D．shouldn’t have received |