This is ____ that we mustn't waste time A what B because C w

This is ____ that we mustn't waste time A what B because C w That is w___ we mustn't waste time. They___ the film at that time a.may see b.mustn't see c.must please don't talk.__ time for class.A,This is B,That's C,it' We haven't known ____ there is life on Mars.A.that B.if C.wh Try ___ your time any more. A.don't waste B.not to waste C.t is this story the same as__in that book?A,the one B,what C,t What we need is___the animals.We mustn't wast time. It is high time that we ____ a meeting to discuss this probl All _____I need is a good rest.A.what B what that C.that D.w Is that ____ you want?A that B that what c what 为什么? what's_?__a pen ?a 、this;this is b 、this;it's c 、 that;that'