The teacher is coming back ___ an hour. [ ]

What were you doing when the UFO arrived?— I with my dog on the street.

Who’s that boy?–Liang Bo. He is _____ very popular singer in Voice of China.

Have you got;E-mail address?—Oh yes, mine is wjb80@yahoo. com,

Friends are those ___make you smile, always open their hearts to you and encourage you to succeed.