He (study) __________ medicine at that time? - Yes, he was.
A.Did he study
B.He was studying
C.Was he studying
D.Were he studying

The father needn’t have given the daughter too much money.
A.The father shouldn’t have given the daughter too much money.
B.The father knew that he didn’t have to give the daughter much money, so he didn’t.
C.The father didn’t have to give the daughter much money because he didn’t have to.
D.The daughter needed more money than the father gave her.

We expected her to be here hours ago.
A.She ought to have been here hours ago.
B.She might have been here hours ago.
C.She is expected to be here hours ago.
D.She shouldn’t have been here hours ago.

Nam should have been told the news a long time ago.
A.Nam did not tell the news a long time ago.
B.Nam had not told the news for a long time.
C.Nam was not told the news although it was necessary for him.
D.Nam has not been told the news for a long time although he should know it.

Trung ought to have made more effort to locate his book.
A.It is necessary for Trung to try harder if he wants to locate his book.
B.Trung must have worked hard in order to locate his book.
C.Trung didn’t try as hard as he should have to find his book.
D.Trung has to make the effort himself if he wishes to find his brother.

It couldn’t have been Huong that you heard shouting last night, as she is vacationing in Da Nang at the moment.
A.I think Huong is on holiday in Da Nang now, so you may be wrong in thinking that you heard her yelling last night.
B.Right now, she is having a holiday in Da Nang, so it is nearly impossible that it was Huong whose shouting you heard last night.
C.Are you sure it was Huong who shouted to you last night, because, as far as I know, she is on vacation in Da Nang at the moment?
D.If it was Huong that you heard yelling last night, then she can’t be taking a vacation in Da Nang at the moment.

Jane was supposed to have taken her laptop to work this morning. She must have forgotten it.
A.Jane possibly forgot that she had to take her laptop with her to work this morning.
B.It is probable that Jane accidentally left her laptop here, as she had to take it to work this morning.
C.Jane really needs to remember to bring her laptop with her to work this morning.
D.Jane may not have to remember to bring her laptop with her to work this morning although she should have done so.

Paul should have listened to your advice.
A.It was essential that Paul listen to your advice but he didn’t.
B.Paul shouldn’t listen to your advice.
C.Paul didn’t want to take your advice.
D.Paul has listened to your advice.

Columbus (discover) ________ America more than 400 years ago.
A.discovered
B.was discovering
C.discovering
D.were discovering

Mrs. Nam (cook) __________dinner when we (arrive) __________.
A.was cooking – was arriving
B.was cooking – arrived
C.cooked – arrived
D.cooked – was arriving