4. He said to me, “Have you ever been to that spa resort?” I said, “Yes, I have”.

=> He _______________________________________________________________________________had.

5. I am happy about your hard work. 

=> I am happy that     ______________________________________________________________________.

6. The mechanic will repair my motorcycle.

=> I   ___________________________________________________________________________________.

7. She began working here in 2005.

=> She has _______________________________________________________________________________.

8. He has bought some tickets so as for his family members to watch the fireworks display.

=> He has bought some tickets so that _________________________________________________________.

9. France presented the Statue of Liberty to the United States in 1876.

=> The Statue ____________________________________________________________________________.

10.  Can I use the phone, Sir?

=> Would________________________________________________________________________________?

Comparative and equal comparison with adverbs. (So sánh hơn và so sánh ngang bằng với trạng từ)

We use many different energy sources to do work for us. Energy sources are classified into two groups - renewable and nonrenewable. Non-renewable energy sources are those that take millions of years to form and will run out some day. It is energy that comes from fossil fuels such as coal, crude oil, and natural gas. Fossil fuels are mainly made up of carbon and were formed millions of years ago. The chemical reaction which takes place when we burn fossil fuels releases carbon compounds such as carbon monoxide and carbon dioxide into the air. Carbon dioxide is one of the green house gases which is contributing to global warming and air pollution. On the other hand, renewable energy sources will never run out, are better for the environment and do not cause pollution. Renewable energy is often called green energy because it is a natural energy, always available and does not have to be formed like nonrenewable energy. The green energy is always there. For example, the Sun consistently shines, water is abundant, and the winds blow throughout the year. The five types include solar, energy from the Sun; geothermal, energy from heat within the Earth; hydroelectric, energy from moving water; biomass, energy from dead plants and microorganisms and finally, energy from the wind.