Before us lies the biggest room, _____ with things like guns, dolls and old clothes.
| A．filling | B．filled |
| C．being filled | D．having been filled |
.Mathematics ______ the language of science.
| A．is | B．has been | C．are | D．have been |
.The young ______ the vital forces in our society.
| A．is | B．has been | C．are | D．have been |
.Every man, woman and child ______ some history, enough at least, to survive in the world.
| A．knows | B．know | C．is known | D．are known |
.None of them ______ my friends.
| A．is | B．are | C．was | D．has been |
.Not only the whole nation, but the whole Europe , indeed the whole human society ______ to alter its attitude to racial problems.
| A．need | B．needs | C．has a need | D．have a need |