jority of rural migrants are engaged in the most painstaking, most tiring and dangerous work, _______ college graduates are reluctant to do.

He has lost the key to the drawer _____ the papers are kept.

The Columbia has finished the task in the International Space Station and is reported to come back to the earth tomorrow, or to be more _____ , at 3:32p.m. local time.

Tom _________my new classmate.

That is my friend. ______ name is Mary.