The scientists are studying the effects of human activities______the environment.
| A．in | B．at | C．on | D．with |
---I’m sure Andrew will win the first prize in the final．
---I think so．He ______ for it for months．
| A．is preparing | B．was preparing | C．had been preparing | D．has been preparing |
All the students ______ gets along very well with will be invited to her birthday party．
| A．who | B．that | C．she | D．what |
Some old Chinese customs, many of you are too young to know, have already died out．
| A．what | B．that | C．how | D．as |
Whether ways will be found to stop pollution or not is just _______ worries the public．
| A．why | B．which | C．that | D．what |
It’s necessary to be prepared for a job interview．___ the answers ready will be of great help．
| A．To have had | B．Having had | C．Have | D．Having |