15. On the way, you can see this sign (A) and it warns that _______________.

(A)

A. You must be careful with drunk drivers.              

B. You should be careful since there is a pub ahead.

C. You shouldn’t drive under influence of drugs.

D. You mustn’t drive a car or ride a motorbike after drinking beer or wine.

16. At the public we can see this sign (B), it means _______________.

(B)

A. You should not make this place tidy.

B. Putting unused things into the garbage dump is necessary.

C. Recycling is very important to protect the environment.

D. You shouldn’t throw your garbage here.