Answer:
1) Images from the Hubble Telescope are amazing; they give us a better understanding of the universe.
2) There are a number of sources of alternative fuels; however, some are extremely expensive to use.
3) Life sometimes gets discouraging on Earth, so men have often looked to the stars.
4) Complete this worksheet; then submit it to be graded.
5) It's never too late to learn to play an instrument; you just need to practice.
6) There's only one road into the city; alternatively, we could fly in.
7) She saw them sitting in the audience; then she became really nervous.
Explanation:
