1 none

2 a - the

3 the - the

4 the - a

5 none - the

6 the - none

1 C

2 C

3 B

4 B

5 C

6 C

7 C

8 B

9 C

10 D

11 A

12 B

13 C

14 B

15 C

16 A

17 D

18 A

19 C

20 D

dạ 

I sometimes write blogs to describe my feelings

1 Tom's room is the cleanest of all

2 Of all Polish writers, Scienkiewicz is the greatest one

3 Egypt is one of the oldest countries in the world

4 In the world, Canada is the second largest country

5 Winter is the worst time for us

6 It is the ugliest town I know

7 This is the widest road in the country

8 What is the smallest animal in the world?

9 Is the elephant whale the biggest animal in the world?

10 I am the worst student in the class

1 although

2 improve

3 addition

4 result 

5 without

Ex2

1 Of you don't stop smoking, you won't be healthy

2 Unless people learn how to swim, they can't swim

3 If these project hadn't been out of date, the manager wouldn't have looked so sad

4 If it weren't for his laziness, he wouldn't fail the English test

5 If people had helped John, he would habe passed the exam

Ex1

1 were

2 invited

3 would have seen - had gone

4 won't let

5 knew - would come

6 will we do

7 would have made

8 stopped