________ you happen to see Mary, would you please askher to come here

It’s hard sometimes___the future.

In order to enter the PE exam, now we spend at _____least half _____hour a day at school.

What I want tototeenagers is that being addicted to the Internet will to some extent do harm toboth mental and physical health．

11. Madonna ______ a straight–A student, but it was dancing that she was really crazy about.