4. After being in the sun, use sunscreen every two hours.

     3. Make sure there is at least one grown--up (成年人) that teaches lifesaving skills.

     2. After you use sunscreen (防晒霜), give it 20 to 30 minutes to dry before you go outside.

     1. Don't run anywhere in the pool area.

(    ) 4. In Mrs. Green's class, we often play games.

(    ) 3. In Mr. Black's class, students do not have much time to speak English.

(    ) 2. Mr. Black told us that English was the most important language in the world.

(    ) 1. This year our English teacher is still Mr. Black.