The student went through the paper, finding some mistakes that might         have been ignored．

We could hardly believe what she says because she is ________ changing her mind. 

Don’t defend him any more. It’s obvious that he ______ destroyed the fence of the garden even without apology.

There was such a long queue for coffee at the interval that we_________gave up.

The rapidly growing birth rate brings about a lot of environment problems, which the government is supposed to take _____.