-- ______ do you exercise? --Three times a week.
—I’m afraid that I can't pass the English exam next week.-_______. Just try your best.
-Look at this picture. There is a bridge_______ the river, and there are three birds_______ the tree.
-Sandy, do you like English?-Yes, I spend half an hour_______ English every day.
The girl is_______ to go to school by herself.
_______ packets of salt do you want?