--- How cool you look in this shirt! How much did you ______ on it?---Not very expensive. It’s just one hundred yuan.
In our library, the number of books ________ more than 40,000.
The entrance exam is only fifteen days away from now. You will fail the exam ______ you study hard from now on.
Jack found ______ hard to get along with the other boys in his class.
I have _______ to tell you. Please listen to me.
Tom is sad. Everyone is trying to _______.