don’t try your best to learn all subjects, youwill ___ behind

Jenny, you can’t go out to play _____ you finish your homework.

I wonder why Sara looks worried today.—I’m not sure，but she 　　　　 a small accident driving here.

．— Could you please tell me ______?— It’s next to the post office.

This story is ________ easier and ________ interesting to read than that one.