1. You should wear a __________ when you ride a bike. A. mask B. helmet C. scarf D. seatbelt 2. This road sign shows "____________________" A. Maximum speed B. Minimum speed C. Average speed D. Overtaking speed 3. Mr. Brown sometimes goes sightseeing by __________. A. plane B. bike C. car D. boat 4. This road sign means "________________" A. Bump B. No traffic C. Danger D. Give way III. Choose the best answer.