I.1b algae

2a measure

3d poison

4a shake

5c northern

II.1d were

2c look

3a taken

4d important

5c cleaning

6b been

7c in

8a speaking

9c will

10a what

11b lead

12c moves

13a accent

14c had

15b have

III.

1 homeless

2 poisonous

3 native

4 tropical

5 contaminated

6 injured

7 exactly

8 mother

9 damage

10 official

III.

1 homeless

2 poisonous

3 native

4 tropical

5 contaminated

6 injured

7 exactly

8 mother

9 damage

10 official

IV.1 will...take

2 have given

3 do....practise

4 get

5 Have....left

6 wouldn't go

7 attends

8 fed

9 travelling

10 hasn't managed

Answer : 

Ex1 :

1b 

2a

3d

4a 

5c 

Ex2.

1d 

2c 

3a 

4d 

5c 

6b

7c 

8a

9c 

10a 

11b 

12c 

13a 

14c 

15b 

Ex3:

1 homeless

2 poisonous

3 native

4 tropical

5 contaminated

6 injured

7 exactly

8 mother

9 damage

10 official

Ex4:

1 will...take

2 have given

3 do....practise

4 get

5 Have....left

6 wouldn't go

7 attends

8 fed

9 travelling

10 hasn't managed

Good luck !