Use the correct form of the given word to complete the following sentences:

The outdoor centre organizes lots of ... activities for the kids, like cycling. (energy)

Use the correct form of the given word to complete the following sentences:

A number of different ... in the river have caused the death of all fish. (pollute)

Use the correct form of the given word to complete the following sentences:

According to ..., we could be facing a crisis within 50 years. (environment)

Use the correct form of the given word to complete the following sentences:

Litter is often a big problem in ... areas. (resident)

Fill in the blank with one appropriate preposition to complete the following sentence :

Children should be warned ... the dangers of drugs.