---Why did Tom become wealthy this year?---Because he sold _________________ he did last year.
Instructions for homework have to be ______ so that every student knows clearly what is to do after class.
It was essential that the application forms ___________ back before the deadline .
Don’t ________ more work than you can do, or you will ________.
The woman she acted in the film is ______ the women in the 1930s.
Doctors are doing research to find out what happens physically when people______ smoking.