The villa built of _____ was once used as a warehouse.
A. stone
B. stones
C. a stone
D. some stones
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The vegetable soup tastes of ________.
A. onions
B. an onion
C. the onion
D. onion
Did you have _______ at the party?
A. your funs
B. a fun
C. funs
D. fun
The _______ of airline pilots are boarding thr plane.
A. class
B. crew
C. party
D. cluster
我国什么时候设置算学馆?
A. 隋
B. 唐
C. 宋
D. 元