5. D. because
6. D. consequently
7. A. because of
8. D. due to
9. A. lead to
10. C. because of
V. Combine the sentences in each pair into a new sentence
1. Because sea levels are rising, the polar icecaps are melting
2. Because of increase in the global population, there are much better levels of nutrition
3. Nuclear explosions and detonations of nuclear weapons lead to radioactive pollution
4. More and more roads are being built so air pollution is rising