Trees are good for human being. We can’t plant them __________ many.

I’m sorry that what I said just now has hurt you, but I didn’t do it _____.

 Young children seem to master computer games __________. And playing computer games will always make them feel ___________.

We could hardly believe what she says because she is____ ____changing her mind.

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