1 You look unhappy.What's the p___?2 His parents always a_____,he doesn't want to live with them.3 Ann is looking for her ___ pen? A.lose B. lost C.miss D.losing4 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）

problem
??
lost
not enough
used to do by himself

1.problem
2.argue
3.losing
4.isn't enough
5.used to do by himself

1 You look unhappy.What's the problem?2 His parents always argue,he doesn't want to live with them.3 Ann is looking for her lost pen?A.lose B.lost C.miss D.losing 4 My sister is too young to join the ...

1. problem
2. argue
3. B丢失的
4. is old enough
5. He is used to finish his homework by himself