Often ___________ not to touch the poisonous chemical.
A. does Fort warn us
B. Fort warned us
C. Fort wans us
D. had Fort warned us
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Against the wall on the opposite side _____________.
A. there stand two cupboards
B. two cupboards stand there
C. there two caupboards stand
D. stand two cupboards
It is usually cool here in summer, but in Los Angelas it ______________.
A. is rarely
B. rarely is
C. hardly is
D. scarcely is
"That English Fellow's songs are very poetic.""___________ the words to the songs, but he also composes the music."
A. He also writes
B. Although he writes
C. Not only does he write
D. It is not all that he writes
对于一种商品，消费者想要有的数量都已有了，这时，（ ）。
A. 边际效用最大；
B. 边际效用为零；
C. 总效用为零；
D. 总效用最大。
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