Air _______is a consequence of fossil fuel burning by motor vehicles, factories, aircraft and rockets.(pollute) 
A.
B.
C.
D.

Write an article to introduce a tour to Ninh Binh - Cue Phuong National Park. Follow this plan:- Introduction to the place- The price for a 2-day tour, tourists' activities and travel time- The price of a 3 –day tour, tourists’ activities and travel time- Booking
A.
B.
C.
D.

What activities or projects can ecotourists take part in to protect the local environment?
A.
B.
C.
D.

How do ecotourists benefit the local economy and local people?
A.
B.
C.
D.

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.