I will do my best to get it for you ______ I could remember who last borrowed it.

As we all know, parents are concerned _____ their children’s study, because it is concerned ____ their future .

___________ did you buy your e-dictionary, Frank—Two days ago.

Protect yourself from strong sunlight. You know,skin cancer can be caused by too much ________ the sun. [ ]

I’ll leave him a note _______ he’ll knowwhere we are.