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My neighbours have ___ cat and ____ hamster(仓鼠).

A. a, a

B. an, a

C. the, the

D. a, the

What is a preposition? 
A. tells location 
B. person, place, thing, idea
C. action 
D. replaces a noun 

The first laser ——- in 1960 by Maiman almost half a century after the publication of Einstein’s theory of radiation which ——- the possibility of laser operation.

A. has been demonstrated / had shown

B. had been demonstrated / showed

C. was demonstrated / showed

D. demonstrates / was shown

E. was being demonstrated / shows

Neither Jenny nor her sisters ____________ about their friends often.

A. talk

B. talks

C. is talking

D. are talking