These days students in some schools ______ not to use mobile phones. 

 — Alice, you ______ on the phone.— I’m coming. Thanks.

--- It’s difficult for the village children to cross the river for school. --- I think a bridge ________ over the river. 

—I ___________ a science fiction from the library．—Really ? How long ________ it _________

Another two months will be needed before the bridge _______.