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习题是这样的Direction:Form compound sentences by adding another se

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习题是这样的
Direction:
Form compound sentences by adding another sentence to the following sentences.Be sure to complete the sentence with a subject and a verb.
例子:The college campus is located in the center of the city,so(it is very easy to get there by public transportation.)
1.Does the universe have an outer edge or _______.
2.Scientists predict that intelligent life exists somewhere in the universe but________.
3.Mars probes have photographed rocks with water markings on them yet______.
4.We may not be able to communicate with other life forms for______.
5.Instead of taking the psychology final exam,we can write a 10-page research paper or_______.
6.Three weeks before the end of the term,I had not started by paper nor____.
7.I needed help choosing a topic so_____.
1.Does the universe have an outer edge or _is it endless______.
2.Scientists predict that intelligent life exists somewhere in the universe but_no one has find any trace about them_______.
3.Mars probes have photographed rocks with water markings on them yet_they have not find water_____.

4.We may not be able to communicate with other life forms for__they are using other form of languages____.
5.Instead of taking the psychology final exam, we can write a 10-page research paper or__make a speech contest_____.
6.Three weeks before the end of the term, I had not started by paper nor_did any preparation for test___.

7.I needed help choosing a topic so_that I can finish the paper in time____.