In what way can a cruise ship become a source of air and water pollution?
A.
B.
C.
D.

Why do ecotourists prefer a biking or walking tour to a bus tour?
A.
B.
C.
D.

Going swimming in the river in the summer is interesting. =>It
A.
B.
C.
D.

It’s two years since I last spoke to her. =>I haven’t
A.
B.
C.
D.

 "I'm working in a restaurant, and don't care much for it."she said
=>She said    
A.
B.
C.
D.

In some national parks, tourists are not fully aware of ______ protection.(environment)
A.
B.
C.
D.

Don’t ask him questions about his family. He hates answering ________ questions.(person)
A.
B.
C.
D.

“They must go to the hospital now.” => Brenda said__________________________.
A.
B.
C.
D.

I don’t have his address so I can’t write to him. => If__________________________________.
A.
B.
C.
D.

Tokyo is bigger than Hanoi. => Hanoi isn’t_____________________________.
A.
B.
C.
D.