单项选择题

Some people believe that Mars (火星) could support ______life in the future if ______ right conditions were produced.

A．the; the
B．不填; 不填
C．不填; the
D．the; 不填
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单项选择题
I like to have my bed ______clean and tidy.
A．look
B．looking
C．to look
D．looked
单项选择题
Most of the housework was done by two members of the family, my sister and ______.
A．me
B．I
C．myself
D．mine
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