.
Cars play an important role in modern life , but they ____ also cause many problems like air pollution.
| A．should | B．can | C．must | D．will |
--- Haven’t I told you that you should be home earlier?
--- Yes, but I home earlier than I usually do.
| A．was coming | B．will come | C．came | D．had come |
He collected information on 1,000 people, whose IQ when they were ten years old.
| A．is tested | B．has tested | C．would test | D．had been tested |
Put on your coat! I you down to the doctor.
| A．take | B．am taking | C．took | D．have taken |
increasing the distance of your walks, you may lose more weight.
| A．By | B．From | C．On | D．For |
It’s an old car, it’s very reliable.
| A．so | B．but | C．or | D．And |