The genetic engineering, ______ progress has been very rapid recently, is perhaps the most important of all the sciences．
A．to which B．with which C．in which D．for
---What’s made Tommy so upset?
--- ______, I believe．It shocked him so much．
A．He lost the game B．Lost the game
C．Losing the game D．Because of losing the game
---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
