— How about buying Sam a mobile phone? After all, he isn’t a boy any more. —I think it necessary, for we sometimes want to make sure if he _______ home for dinner.
We should prevent pollution ______ happily.
.It is sleeping late in the morning that ______ being late for work.
______ such heavy pollution already, it may now be too late to clean up the river.
As we joined the big crowd I got ______ from my friends.
—Did you see a man in black pass by just now? —No, sir. I ________ a newspaper.