I have quite ______ friends. I feel very happy.

The teacher didn’t explain the problem clearly, so many students were _____. [ ]

I think it’s impossible for us to work out the plan in just two days. It’s too difficult.—You’re right. We can’t be _______ careful and hard while working on it.

My mother hopes _______ her do some housework first.

I think that ____ very difficult to learn.