15. On the way, you can see this sign and it warns that:

A. The straight road you are coming from has ended.                      

B. Trucks are not allowed.

C. The drivers can park here.

D. All types of motorcycles are not allowed to move on this street.

16. You can see this sign on the computer. The sign means:

A. No emails coming today

B. Don’t forget to close your envelope.

C. Be careful with virus spam in your private mail.

D. Not be seen the envelope opened.