用所给动词的适当形式填空。
【小题1】My dream is_________(become) a great writer like MoYan.
【小题2】The museum_________(build) eight years ago.
【小题3】We _________ (learn) 3,000 English words by the end of last term.
【小题4】He was last seen_________ (leave) his office in New Town at about 7.pm
【小题5】Although shopping online is fast and easy, you’d better __________(not be) crazy about it.

At that moment，he was last __________ the room with his friends．

A．seen leaving       B．to see leave        C．seen to leaving     D．to see to leave

He was last seen _________in his office at about 7:15 p.m..

A. work                        B. working                            C. to work                   D. worked

At that moment，he was last __________ the room with his friends．