One theory, ________ suggested by Harvard University, is that humans began cooking their food, thereby releasing nutrients locked in the raw food and reducing the time needed to chew it.
A.which | B.as |
C.that | D.what |
It is much easier to talk about social change than to .
A.bring it on | B.bring it about | C.bring it up | D.bring it out |
It’s said that there are plenty of hotels in that town. There be any difficulty for you to find somewhere to stay.
A.wouldn’t | B.mustn’t | C.shouldn’t | D.needn’t |
This is a story completely by him, so don’t rust him.
A.discovered | B.invented | C.found | D.known |
If we can’t afford meat we shall have to with fish.
A.do | B.go | C.eat | D.deal |
Historical experience can as a most important source of information.
A.serve | B.use | C.regard | D.prove |