Make a complex sentence from each pair of sentences. Use the subordinator (

because, so that, before, although) to fill in the blank.

We’ll have to phone you organizing the trip.

Choose the best answer.

________ pollution can directly cause hearing loss.

Choose the best answer.

Ships spill oil in oceans and rivers. This leads ________ the death of many aquatic animals and plants.

Choose the best answer.

To protect the environment, we should use more _______ sources of energy as wind and solar power.

Choose the best answer.

Households pollute water sources by _______ waste into ponds, lakes, and rivers.

Choose the best answer.

_______ are things that make the air, water, and soil unclean or contaminated.

Choose the best answer.

Water pollution can put negative _________ on our health.

Choose the best answer.

Water pollution has _______ many diseases for plants, animals and especially people.