The number of books in the bookshop is about 10,000 and a number of them about science.

He usually ______20 hours every day.

It is raining hard. Will you go to your friend’s birthday party?—I promised him to go, but the heavy rain really places me in a ______. I’m not sure whether I will go or not.

She can play_______ piano, and she plays it ________.

How many workers are there in your factory?－______ the workers in my factory_______ over two thousand .