Many people may be surprised by the number of chemicals that they are exposed to through everyday household products.
I hope there are enough glasses for each guest to have____ .
A sheep ____on this kind of special grass which usually grows much faster than ____on ordinary.
Forty percent of the students in our class are boys, ____are girls.
They were all very tired, but ___of them would stop to take a rest.
If a student can make what ___has been learned , whether in class or from social practice,he will make steady progress.