4 Complete the sentences from exercise 3. Then choose the correct options in the
rules.
1 Renewable energy such as wind and solar power
cheaper.
2 Countries in the northern hemisphere
warmer.
3 Natural resources - too quickly.

1. Renewable energy such as wind and solar power is ________ than traditional energy sources.

To complete this sentence, we need to choose the correct option from the rules. The rules state that when comparing two things, we use the comparative form of the adjective. In this case, we are comparing the cost of renewable energy with traditional energy sources. The adjective "cheaper" is the comparative form of "cheap," so it is the correct option to complete the sentence.

2. Countries in the northern hemisphere are ________ than countries in the southern hemisphere.

To complete this sentence, we need to choose the correct option from the rules. The rules state that when comparing two things, we use the comparative form of the adjective. In this case, we are comparing the temperature of countries in the northern hemisphere with countries in the southern hemisphere. The adjective "warmer" is the comparative form of "warm," so it is the correct option to complete the sentence.

3. Natural resources are being used ________.

To complete this sentence, we need to choose the correct option from the rules. The rules state that when something is happening too quickly, we use the adverb form of the adjective with "too." In this case, we are describing how natural resources are being used. The adverb form of the adjective "quick" is "quickly," so it is the correct option to complete the sentence.