—Your T- shirt is nice. It must be expensive.
—Not at all. I only spend $10 __________ it.
A:in
B:on
C:for
D:of
Jim studies better than Tom, but Tom is ______ and he has more friends.
幼年时期生长激素分泌不足,人体会患( )
多数科学家认为人类进化的主要历程为( )
①能人阶段 ②南方古猿阶段 ③智人阶段 ④直立人阶段.
依法纳税是公民应尽的一项基本权利。( )