This is a difficult and stressful job, but one ______ you can really help people.
| A．that | B．where | C．which | D．of which |
Whoever leaves the lab last, _____ all the lights are turned off.
| A．make sure | B．make sure of | C．be sure | D．be sure of |
Nobody can tell _____ the future world will look like.
| A．how | B．what | C．when | D．where |
— I put him down for a well-educated man.
—______ ?
— I mean that he's a well-educated man.
| A．I beg your pardon | B．Speak louder, will you |
| C．What’s that | D．Will you repeat word for word |
The silence of the library is sometimes broken by a sudden cough or the sound of pages______.
| A．turning | B．turned | C．being turned | D．having turned |
Wang Pin is an advanced worker in our company. He _______ for four years in Yangzhou University.
| A．studied | B．has studied | C．had studied | D．has been studying |