Complete the sentences with modals. Use proper tense forms.

1) You must not park here, it's strictly forbidden. 2) Are you able to understand his singing? 3) Children must wash their hands before taking meals. 4) She is too sick. She cannot walk and must stay in bed. 5) I had to go to the next shop because I was unable to buy any bread in the nearest one. 6) You must not smoke here. 7) The city is a big jungle where you can easily get lost. 8) Everybody must know how to escape from fire. 9) Elephants can carry big logs. 10) I used to sing well.