It be the vocabulary that caused you the problem in the exercise because you know a lot of words

A.
may
B.
couldn^’t
C.
should
D.
needn^’t

You needn’t have apologized for your absence—______, it’s hardly your fault.

A.
therefore
B.
however
C.
meanwhile
D.
Besides

The conventional view_______ that the Mars’ atmosphere is very poor because the planet lacks a magnetic field

A.
covers
B.
holds
C.
possesses
D.
contains

I ____ to the top of the tree, but I fell off it and hurt my leg

A.
must have climbed
B.
was able to climb
C.
could have climbed
D.
should have climbed

—Who called me this morning when I was out?
—A man calling ______ Robert

A.
him
B.
himself
C.
his
D.
不填

---Mr Smith , I’m sorry I used your telephone when you were away this morning .
--- ____________

A.
That’s all right
B.
It’s a pleasure
C.
You are welcome
D.
Don’t mention it

Let’s visit the National Museum this weekend, _______?

A.
will you
B.
won’t we
C.
don’t we
D.
shall we

Unluckily I don’t have a lot of ______ memories of my childhood. There were no good friends, no amazing adventures, and no wonderful holidays

A.
persuasive
B.
ordinary
C.
fantastic
D.
honorable

I _________ Lucy to be careful with her handwriting all the time, but she hasn’t polished it at all

A.
told
B.
have been telling
C.
will be telling
D.
have told

---Isn’t that Ann’s husband over there?
---No, it _______ be him—I’m sure he doesn’t wear glasses.

A.
can’t
B.
must not
C.
won’t
D.
may not

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