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access approach attitude attraction
to watch to be watched watching being watched
turn turning turned having turned
P.光对水的折射率小于Q.光对水的折射率 P.光在水中的传播速度小于Q.光在水中的传播速度 P.光恰能使某金属发生光电效应，则Q.光不能使该金属发生光电效应 用P.和Q.发出的光分别照射同一双缝干涉装置，P.光条纹间距小于Q.光条纹间距
no more no doubt no wonder no luck
they agreed they did agree agreed they did they agree
Unless While Now that Even if
as much as many so much so many
There is no point There is no need It is no wonder It is no way
As a result In other words What is more First of all
/ ；a a ；the / ；the the ；a
might not have heard should not have heard mustn’t hear shouldn’t hear
May ; can Can ; can Will ; will Should ; may
at ; on with ; at for ; in by ; for
pardon me go ahead good idea forget it
make it out make it off make it up make it over
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