— I have got a backache.
— That’s not surprising. You ______ in front of that computer too long.
| A．work | B．worked | C．have been working | D．are working |
In the cross-lake swimming race, a boat will be ____in case of an emergency.
| A．standing by | B．turning on | C．getting on | D．running on |
The teacher has a peculiar way of ______her student’s nervousness when then speak English.
| A．breaking down | B．going over | C．taking off | D．giving away |
It was already past midnight and only three young men ______in the house.
| A．left | B．remained | C．delayed | D．deserted |
Modern plastics can ______very high and very low temperatures.
| A．stand | B．seeking | C．finding | D．looking for |
The company is atarting a new advertising campaign to ______new custumers to its stores.
| A．join | B．attract | C．stick | D．transfer |