Choose the proper words to complete the sentences with their correct forms.

1. The _________ will become more and more serious if the number of cars and trucks gets larger and larger. 2. I didn’t _______ the traffic signal just now and ran the red light. 3. ________ riding caused his injury. 4. Motorcycle riders without ________ will get a fine when riding. 5. Don’t worry about her. She is in ________.

care helmet notice safe pollute

pollution

notice

Careless

helmets

safety