Professor Smith, along with his assistants, _______ on the project day and night to meet the deadline.
| A．work | B．working | C．is working | D．are working |
A government, which is responsible for society, must to its people how important the method is to prevent AIDS.
| A．get through | B．get on | C．get over | D．get across |
Mum, you really need to have a rest! You in the kitchen ever since you came back home three hours ago.
| A．had worked | B．were working | C．have been working | D．worked |
A new simplified desktop computer has been developed for people aged over 60 to make them with PC and the Internet.
| A．familiar | B．aware | C．popular | D．conscious |
We have to study for a bright future, so we have to lose some sleep we're worn out.
| A．in case | B．as though | C．as long as | D．even though |
Nowadays electrical energy from the sun has become the most widely used energy.
| A．comes | B．coming | C．to come | D．came |