Bill is running so fast!I _________believe my eyes.（ ）
A．needn'tB．shouldn'tC．mustn'tD．can't
Summer vacation is coming! I am thinking about visiting some places of interest．
Why not____Jingzhou and have a look at the ancient city wall？（ ）
A．come outB．come along
C．come up withD．come over to
We are planning a Yangtze River Protection Day this weekend． Do you have any advice？
You'd better ____signs around the school to tell all the students about that．（ ）
A．make upB．put upC．set upD．show up
There is always a smile on your face． Isn't there any trouble in your life？
Yes， there is． But life is like a mirror．______ you smile at it， it will smile back．（ ）
A．WhenB．BeforeC．UntilD．After
Many products made in China are very popular in the United States．
Yeah． Americans can _____avoid buying Chinese products．（ ）
A．nearlyB．mostlyC．hardlyD．widely
Can we walk across the road now？
No， we____． We have to wait until the light turns green．（ ）
A．couldn'tB．needn'tC．shouldn'tD．mustn't