I have been living in the United States for 20 years, but seldom ________ so lonely as now.
| A．have I felt | B．I had felt |
| C．I have felt | D．had I felt |
. In aerospace devices the weight of the necessary power producing equipment is _____.
| A．vital | B．possible | C．capable | D．reliable |
There was a good _____ of the countryside from the front of the bus.
| A．sight | B．view | C．scene | D．scenery |
Circus tigers, although they have been tamed, can _____ attack their trainer.
| A．unexpectedly | B．hopefuuly | C．reluctantly | D．willingly |
The _____ of his clothes indicated too clearly that he had been playing football.
| A．state | B．condition | C．occasion | D．situation |
He put in a special _____ for an extra day's holiday so that he could attend his daughter's wedding.
| A．request | B．demand | C．requirement | D．proposal |