I was not _______her presence till she spoke to me.

People have ____too many trees to make desks, chairs, chopsticks and so on.

Do you think that housing price will keep_______in the years to come?—Sorry,I have no idea.

The problem of the present world is that those who are imaginative have little experiencethose who are experienced have weak imagination

He flew to Paris two hours ago，he would stay for three days