It is impossible for ______ little children to do ______ much work in ______ a short time.
There is a real possibility that these animals could be frightened, ________ a sudden loud noise.
–This summer is very hot. --Yes, but it’s not __________ as hot as last summer.
Our teacher entered the classroom, __________.
–What do you think the noise was? --It ___________ a cat.
Do you know the _________ of the saying I just quoted?