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...... and decorate their homes(clean) 5/ if you ........ a UFO, what would you do??(see) 6/ in Australia, a tropical storm ........... as a 'cyclone' (know) 7/ everything is going well. We.......... any problem so far (not have)

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