we to be careful of rats since the whole street was full of rubbish.
A. warned
B. have warned
C. have been warned
D. were warning
When I got to his home, I that he to Beijing.
A. told; had gone
B. was told; went
C. was told; had gone
D. told; had been
His father several times during the war of liberation.
A. had been wounded
B. was wounded
C. wounded
D. had wounded
In the past it people two years to go round the world.
A. had taken
B. has taken
C. took
D. was taking
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