1You look unhappy.What's the p___?
2His parents always a_____,he doesn't want to live with them.
3Ann is looking for her ___ pen?
A.lose B. lost C.miss D.losing
4 My sister is too young to join the army.(改同义句）
My sister ____ old ____ to join the army.
5 He is ____ ____ ____ his homework ____ ____.(他习惯于自己完成作业）