do the gardening->doing the gardening

2.gather and hunt->gathering and hunting

3.sent->send

4.of ->with

5.has->have

1.when did captain Philips arrive in Sydney

where did captain Philips arrive in 1788

2.Elephant is stronger than buffalo

5.a  6.b  7.b  8.a

1.the house was been dirty because she hadn't cleaned it for weeks

2.the baby girl is being taken care by her

3.the old man should be treated with respect by the children

4.new T-shirt was being worn by her when she was met yesterday

5.these postcard are sent to us by our friends

6.this dish is brought to me by the waiter

7.this story was told to them by their grandmother when she was visited last week

8.this train ticket was ordered for his mother by Tim

9.the special cameras wasn't shown to me 

10.the ticket was shown to the airline agent by her

34.Whose are these beautiful ornaments ?

35.A lot of local specialities are sold at the open-air market by local people

36.The hurricane prevented me from traveling to Sa Pa with my family

37.Nowadays, teenagers rely on the technology more than in past

38.I had my first experience of farm work on trip to the countryside

39.Sitting in front of a computer all day can cause health problems

40.Some minorities still keep their traditional ways of life in mountains

1.faster

2.heavier

3.worse

4.higher

5.longer

6.colder

7.more difficult

8.younger

9.shorter

10.better

MgO;ZnCl2;Cu(NO3)2;

a.Fe hóa trị 3

b.FeCo3 hóa trị 2

2.are learning

3.didnt-go

4.eat and drink

5.visited-bought

6.is calling

7.will travel

8.do your parents go

9.was your mother watched

10.is going