1 If you aren't careful, you ______ hurt.

2 What will happen if the parachute ______?

3 I won't sign up for the dancing competition unless Jack ______ my partner.

4 When you ______ Tom, tell him I want to see him.

5 If they make a good offer, I ______ the house.

6 If the people don't come, we ______ to cancel the party.

7 Please, can you close the windows before you ______.

8 He'll try to get money from you if he ______ you've won the lottery.

9 Before you say anything, ______.

10 He won't ask for help unless it _______ absolutely necessary.