My wife didn’t leave the car keys, so I couldn’t pick her up at the station.
A.If my wife had leave the car keys, I could pick her up at the station.
B.If my wife had left the car keys, I could pick her up at the station.
C.If my wife had left the car keys, I could have picked her up at the station.
D.If my wife had left the car keys, I could picked her up at the station.

Peter can answer the questions more intelligent than I can.
A.peter
B.answer
C.intelligent
D.can

She never go home before she has finished her work.
A.never
B.go
C.before
D.has finished

This is the bank from that we borrowed the money.
A.this is
B.from that
C.borrowed
D.the money

-Helen: “________ detective stories?” -Paul: “In my opinion, they are very good for teenagers.”
A.What do people feel about
B.Are you fond of
C.How about
D.what do you think about

_______ extreme bad weather in the mountains, we’re no longer considering our skiing strip.
A.Despite
B.Since
C.Due to
D.Because

It was a nasty memory. Do you remember both of us wearing sunglasses to avoid ___________ by the supervisors? [nasty: disgusting]
A.being recognized
B.to be recognized
C.to recognize
D.recognizing

The hotel was so awful that we wrote a letter of _______ to the travel agency when we got back.

A.relief
B.warning
C.thanks
D.complaint

Rewrite the following sentences and the meaning stays the same.
It was my first visit to North America.
A.I have never been to North America before.
B.I have never been to North America then.
C.I had never been to North America before.
D.I have never been to North America.

The appearance of one or several species may result in the loss of __________.
A.biology
B.biodiversity
C.diversity
D.university