It is natural that one's attitude () his family changes as he grows older.

单项选择题Not knowing what to do next, () his tutor for advice.

A. will he go to
B. he is going to
C. did he go to
D. he went to

单项选择题The professor requests that we () the term papers by the end of this month.

A. will hand in
B. will have handed in
C. to hand in
D. hand in