Three trees can do the job of 15air-conditioners _________ almost all day.
| A．run | B．are running | C．ran | D．running |
It ________ him half an hour to drive home every day .
| A．costs | B．spends | C．takes | D．uses |
The dish looks good, but when I eat it, it ________very terrible.
| A．tastes | B．smell | C．look | D．sounds |
As students, we are supposed to spend more time _________ .
| A． study | B．studied | C．studying | D．to study |
When __________ he supposed to arrive yesterday?
| A．are | B．was | C．were | D．is |
He was made _________ from morning till night.
| A．work | B．working | C．to work | D．worked |