VI.Complete the following sentences,using the verb ''get'' or ''become'' and one suitable adjective from the box in the comparative form:good,strong,bad,busy,cold,polluted,noisy,high,difficult,hot.
1.Streets are very quiet in the early morning,but they_____when people start going to work.
2.The lessons in schools are easy at the beginning,but they_____later.
3.The traffic is very bad now.If we don't have any positive measures with it,the traffic will_____.
4.The weather was awful yesterday,but today it is_____.
5.It is cold in fall,and it even_____in winter.
6.I have_____since I went to work.I was freer in the past.
7.The Earth is _____.The temperatures are increasingly growing up.
8.The environment is_____.We must protect it from pollution.
9.The cost of living is_____even though it was very high last year.
10.He was very weak as a child but now he is_____.