Mr Li required the computer equipment referred ________ used in every classroom.

A. should be                                                B. have to be              

C. to be                                                       D. to being

---Why was Mr. Li so happy this morning?
---Because he was        with an award for excellence in teaching.

Mr Li was out of touch last week. The police _______ for him since.

A. have been searching　　　　　　　　　　　　　　 B. were searching

C. had searched　　　　　　　　　　　　　　　　　　　　　　　 D. has searched

He suggested us ________ here for Mr. Li, our math teacher.

A．should wait        B．waited            C．to wait            D．waiting

The twins look the same. Mr Li find ______ hard to tell one from the other.

A it           B them     C her     D that