选择框中动词词组的适当形式填空。

look forward to  hear from   hang out  have to  grow up

Peter wants to be a teacher when he                .
I’m very happy to                my pen pal in Australia.
Mingming is                 visiting his grandparents this winter holiday.
Anna likes to                 with her friends when she is free.
The rain is very heavy so we                 stay at home.