X. Rewrite each sentence, using the word given in the brackets. 1. Our sources of energy will soon end if we don't try to save them. (Unless)  ________________________________________________________________________________. 2. Unless John is nervous, he will pass the driving exam. (If)  ________________________________________________________________________________. 3. No one in our football team is more skillful than Quang Hai. (most)  ________________________________________________________________________________. 4. There is less noise in the country than there is in the city. (as)  ________________________________________________________________________________. 5. Why don’t we travel to Phu Quoc this summer? (How)  ________________________________________________________________________________

1. Unless we try to save our sources of energy, they will soon end.
2. If John is not nervous, he will pass the driving exam.
3. Quang Hai is the most skillful in our football team.
4. The country is not as noisy as the city.
5. How about traveling to Phu Quoc this summer?