Sam is my friend, he is a _____ boy now.

Your iPad mini 2 is quite cheap. Where did you buy ________ I want to buy ________, too.

Personal computers were in use in China when Amy visited the country in twentieth century(世纪).

Go to bed early and sleep well. You can work ________ tomorrow morning.

________him that she would fail as she was so able and worked so hard.[ ]