1/............. air can cause illness and even death
A .polluted   B.pollution   C. Polluting   D.Pollute
2/Mr Toan ............. teaches us Biology is wearing a blue shirt
A. Whom   B. Who   C. Which     D. Whose
3/ if we plant more trees along the streets, we......... the amount of pollution in the atmosphere
A. Reduce  B. Reduced  C. Will reduce   D. Would reduce
4/ it's a time for family.. to clean.... and decorate their homes(clean)
5/ if you ....saw.... a UFO, what would you do??(see)
6/ in Australia, a tropical storm ....known....... as a 'cyclone' (know)
7/ everything is going well. We....have not had...... any problem so far (not have)

#NOCOPY 

1.B

2.B

3.C

4.to clean

5.saw

6.known

7.haven't had