My father worked day and night. Otherwise, there ________ no one to support the family.

—What do you think we can do for our aged parents？—You　　　　do anything except that you visit them as often as possible. 

The president desires that you _________ him next week.

After her son’s death, the old lady _____ sit at the window, deep in thought．

 One of our rules is that every student    wear school uniform while at school.