“What’s the answer to the problem?” – “I don’t know and even __________ , I wouldn’t tell you.
A.if I do
B.if I did
C.though I did
D.I did

Human beings have driven rare animals and plants __________ of extinction in the past 100 years.
A.on the verge
B.under the verge
C.at the verge
D.to the verge

“Those students study a lot”. – “Yes, __________ students are very serious.”
A.almost of
B.almost
C.most of
D.most

You can stay here __________ you don’t make a loud noise.
A.as long as
B.unless
C.until
D.otherwise

He __________ having sent the anonymous letter.
A.opposed
B.refused
C.accepted
D.denied

He had suffered __________ loss of memory before he died.
A.along
B.from
C.about
D.with

Have you learnt the reason why does the water of the ocean becomes blue?
A.reason
B.does
C.of
D.blue

If either of you take a vacation now, we won’t be able to finish this work.
A.either
B.take
C.won’t be able
D.to finish

"I will let you know the answer by the end of this week,” Tom said to Janet.
A.Tom suggested giving Janet the answer by the end of the week.
B.Tom promised to give Janet the answer by the end of the week.
C.Tom insisted on letting Janet know the answer by the end of the week.
D.Tom offered to give Janet the answer by the end of the week.

I’d prefer him not to have said all those embarrassing things about me.
A.I’d not prefer his saying all those embarrassing things about me.
B.I’d prefer him not saying all those embarrassing things about me.
C.His having said all those things about me is preferentially embarrassing.
D.I’d sooner he hadn’t said all those embarrassing things about me.