Under no circumstances and at no time __________be the first______ nuclear weapons.
| A．we shall; using | B．shall we; to use | C．shall we; used | D．we shall; using |
.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 |
.Getting to other planets or to the moon _____ many problems.
| A．involve | B．involves | C．involving | D．to involve |
.In that country, the rich ______ richer, the poor, poorer.
| A．become | B． has become | C．becomes | D．is becoming |
.The project requires more labor than ______ because it is extremely difficult.