---Did you notice John was not at home today?
---No. If ________ working, I would have noticed it.

A.
I'd not been
B.
I wasn't
C.
I'd be
D.
I weren't

---Excuse me, I want to have my watch fixed, but I can't find a repair shop．
---I know one nearby．________ I'll show you．

A.
I'm sorry．
B.
Come on．
C.
Congratulations!
D.
What can I do for you?

Oh, now ________．You're supposed to divide 489 by 3．

A.
I get it
B.
I'll take it
C.
you've made it
D.
that will do

What’s really needed, according to most researchers in this field, ________ a“killer”application(应用)particularly suited for the way DNA computing solves problems．

A.
being
B.
are
C.
is
D.
was

---You don’t seem to be quite yourself today．What’s wrong?
---Oh, I’m suffering from a cold．Not serious, _________．

A.
though
B.
anyhow
C.
indeed
D.
yet

---The education system rather than the teachers _ to answer for the overburden on the students．
---I agree．I hope the reform being carried out in our country at present will bring about the _ results．

A.
are; desired
B.
is; desired
C.
are; desiring
D.
is; desiring

---I'm sorry. I can't stay with you. I've got to go.
---________.

A.
Don't think so
B.
I don't think so
C.
Not at all
D.
That's all right

She didn’t end her volleyball career after the Olympics．She went on ________ a university club and became a coach．

A.
joining
B.
to joining
C.
to join
D.
to have joSined

John was the only one ______ I had inviteD．

A.
which
B.
that
C.
whom
D.
who

---What happened?
---As you know, my schoolmates never ______their clothes well.

A.
hanged up
B.
hang
C.
hung
D.
hanged

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