21.Cattle ______ on the hillside.
a. grazes b. is grazing c. was grazing d. were grazing
22.Her politics ______ neither conservative nor liberal.
a. is b. are c. was d. has been
23.Measles ______ a kind of infectious illness.
a. is b. arec. were d. have been
24.The Philippines ______ to the south-east of China.
a. lies b. lie c. lay d. lays
25.Mary is one of the girls who ______ always on time.
a. is b. am c. are d. was
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