Itisdifficulttotellexactlythes

It is difficult to tell exactly ____ the saying began, but it is probable that it was in the theater or movie industry.

A．where

B．when

C．why

D．that

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. ----Daddy，look! Why______rainbow is like a bow?
----Oh，it is apologizing to_______angry sky.

A．the；an

B．a；／

C．a；an

D．the；the

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----Jimmy, shall I give you a ride as you live so far away?
----Thank you very much. __________.

A．It couldn’t be better

B．Of course you can

C．If you like

D．It’s up to you

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As far as I know, this maths problem is _______________ that one.

A．twice so difficult as	B．twice as difficult as
C．as twice difficult as	D．so twice difficult as

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. Tom as well as his classmates __________ a song when the teacher came into the classroom.

A．are singing

B．were singing

C．is singing

D．was singing

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. Only when your identity(身份) has been checked, _____________________.

A．you are allowed in	B．you will be allowed in
C．will you allow in	D．will you be allowed in

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