15. Look at this sign. What does it say?

A. Children left unattended will be sold to the circus.

B. Do not enter. Restricted area. Authorized personnel only.

C. Do not bring flammable materials. Keep fire away.

D. Do not breathe under water

16. Look at this sign. What does it say?

A. Only use this entrance in an emergency.

B. Do not park in front of this entrance.

C. Always keep this door open.

D. Permission is needed to park here.