1.Please, keep silent. You____speak during the exam.

a.may not

b.might not

c.needn't

d.must

2.You____drive at more than 70 miles per hour in the UK.

a.mustn't

b.needn't

c.may not

d.might not

3.You____go to the shop. I have already bought the milk.

a.ought to

b.needn't

c.should

d.may

4.You don't have to be afraid of bear,_____educating yourself about the dangers can help keep you safe

a.but b.so c.therefore d.although

5.Polar bears are beautiful animals,____, they are wild and unpredictable in nature.

a.despite b.however c.so d.therefore

1.Thousands of cranes____

a.will be returned the spring

b.will return the spring

c.will be returned in the spring

d.will return in the spring

2.These boxes____with care.

a.should have handled

b.should be handling

c.should handle

d.should be handled

3.The residents____that there is a crocodile at large in the area.

a.must be warned

b.must have warned

c.may warned

d.may be warning

1.Before he____the project, Bill had to contact an expert in pesticide-use management.

a.could finish

b.could be finished

c.had been finished

d.had to be finished

2.Nuclear waste_____as a liquid in stainless-steel containers which are encased in concrete.

a.must store

b.must be storing

c.must be stored

d.must have stored

1.No explanation is necessary.

It is.........................

1.It____Grace. She has been to Paris on her honeymoon.

a.might have been

b.should have been

c.can't have been

d.must have been

1.Yesterday she went for a picnic with her family. So she____at home when you came.

a.can't have been

b.mustn't have been

c.needn't have been

d.might not have been

2.She___more food because there was a plenty of it in the fridge.

a.needn't have bought

b.can't have bought

c.should have bought

d.must have bought

1.George missed class today. He___an accident.

a.might have had

b.should have had

c.must have had

d.needn't have had

1.They____a lot because they're very good musicians.

a.must have practiced

b.should have practiced

c.might have practiced

d.would have practiced