求英语回答I wonder why they don’t allow ___ the library.a、to use

求英语回答
I wonder why they don’t allow ___ the library.
a、to use
b、 us use
c、 us using
d、 us to use
2
Not knowing what to reply ___ such a question,we kept silent.
a、/
b、to
c、with
d、on
3
Although he was badly hurt,he ___ explain what had happened.
a、could
b、might
c、was able to
d、could not
4
The ___ stuck on the envelope says "By Air".
a、diagram
b、label
c、signal
d、mark
5
It was in Britain ___ he got his Ph.D.
a、where
b、in which
c、that
d、there
6
Who is the boy ___ by the window?
a、type
b、 typing
c、 to be typing
d、 typed
7
What are you ___ if she asks you to stay?
a、doing
b、 to do
c、 to be done
d、to be doing
8
Researchers discovered thatplants infected with a virus give off a gas that ___ disease resistance in beighboring plants.
a、contracts
b、acitvates
c、maintains
d、prescribe
9
There was a big hole in the road which ___ the traffic.
a、set back
b、stood back
c、held up
d、kept down
10
I’d rather you ___ the book to me now.
a、will return
b、 should return
c、 return
d、 returned
11
You ___ here at 9,but now it is already 10.
a、ought to be
b、 need to be
c、 ought to have been
d、 need have been
12
By ___ computation,he estimated that the repairs o the house would cost him a thousand dollars.
a、coarse
b、rude
c、crude
d、rough
13
How many mile have you been ___ today?
a、reached
b、been
c、covered
d、away
14
Now there is no need to worry about the deadline since we are ahead of ___.
a、table
b、 chare
c、schedule
d、graph
15
Reading ___ the lines,I wold say that the Government are more worried than they will admit.
a、behind
b、between
c、along
d、among
16
By the time you get to New York,I ___ forLondon.
a、would be leaving
b、am leaving
c、have already left
d、shall have left
17
___ the form with your name and your address.
a、Write
b、Fill in
c、Take down
d、cover
18
The house isn't big enough for a family of four,and ___,the price is not reasonable.
a、even though
b、furthermore
c、 therefore
d、however
19
If I were yo I ___ accept the invitation.
a、will
b、 would
c、 may
d、 should
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