21.   She first started using drugs when she was thirteen.

22.   The drug is often used to ease the pain of dying cancer patients.

23.   The drug is used to relieve pain.

24.   The drug is used to treat lung disorders.

25.   The FBI caught the Mayor red-handed using drugs.

26.   The idea was tested by using drugs which produced convulsions.

27.   The people who use these drugs are often unaware of the risks they are running.

28.   The school will take strong action against any students using illegal drugs.

29.   They had to use drugs to calm him down.

30.   They had to use drugs to pacify him.