单选题 In the past, it was a small stamp that helped family members and friends to ______ each other.

单选题 Hardly ______ home when it started to rain heavily.

单选题 The policeman told the children ______ play in the street.

单选题 If I ______ you, I would accept the job offer without hesitation.

单选题 The problem is ______ difficult for me ______ solve.

单选题 Not only ______ hard, but he also helped his classmates.

单选题 —Let me introduce the new professor to you. —Mary: ______

单选题 —Thank you for the happy time. I shall never forget this weekend. —Me, either. It has been so ______.