I put my Đáp áns on the table, but now it's gone. Someone_____ have taken it.

A. may

B. had to

C. should

D. would rather

She hasn't eaten anything since yesterday. She_____ be really hungry.

A. might

B. will

C. must

D. can

What you _______ a few minutes ago while your sister _______ the dishes?

A. did...do-washed

2.   did...do-was washing

C. were...doing-washed

D. were...doing-was washing

Do you know two straight lines which _______ at a point _______ an angel?

A. met-formed

2.   have met-have formed

C. meet-have formed

D. meet-form

If Columbus _______ money from Queen Isabella, he _______ across the Atlantic.

A. do not receive/ could not sail

B. had not received/ might not have sailed

C. did not receive/ might not have sailed

D. would not receive/ might not sail

That boy is always _______ lies.

A. saying

2.   talking

C. telling

D. speaking

If someone gave you a boat, what________you_________?

A. do....do

2.   will....do

C. would....do

D. did....do

Would I have had plenty of money now if I ___________ so much yesterday?

A. didn’t spend

B  hadn’t spent

C. spend

D. was spending

St. Catherine’s Monastery Library in Egypt is the first in  the world ___________in the sixth century.

A. to be built

2.   built

C. to built

D. to have built

We  intend to _______________with the old system as soon as we have developed a better one.

A. do up

2.   do in

C. do away

D. do down