.
It’s already 11 o’clock and nobody answers the phone. George ________ asleep now.
| A．must be | B．must have been | C．should be | D．should have 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.
.Not one in one hundred children exposed to the disease ______ likely to develop it.
| A．should be | B．must be | C．is | D．are |