Fill in must or mustn't: 1. I haven't got any money. I ... go to the bank. 2. It's raining. You ... go out without your umbrella. 3. The road is busy. You ... look carefully before you cross it. 4. You ... play football in the house, Jack. 5. My tooth hurts. I ... go to the dentist.

Solution:

• 1. I haven't got any money. I must go to the bank. (It is necessary to go to the bank because there is no money.)
• 2. It's raining. You mustn't go out without your umbrella. (It is forbidden or unsafe to go out without an umbrella when it's raining.)
• 3. The road is busy. You must look carefully before you cross it. (It is necessary to be careful due to the busy road.)
• 4. You mustn't play football in the house, Jack. (It is forbidden to play football inside the house.)
• 5. My tooth hurts. I must go to the dentist. (It is necessary to see a dentist because of the toothache.)

Answer: 1. must 2. mustn't 3. must 4. mustn't 5. must