单项选择题

(You don't) have to worry about making yourself (understand) (as) many people here know (a bit) of English.

A．You don't
B．understand
C．as
D．a bit
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单项选择题
You must follow the directions (exactly), and if you become (confusing), you must (take the time) to go back again and read (them) over.
A．exactly
B．confusing
C．take the time
D．them
单项选择题
(Under) no circumstances (we shall) stop (the) research (we've) begun.
A．Under
B．we shall
C．the
D．we've
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