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X.
1.on
2.in
3.for
4.At
5.with
6.since
7.for
8.on-for
9.in
10.in
VI.
1.otherwise
2.but
3.therefore
4.or
5.Moreover
6.however
7.so
8.and
9.However
10.but
VII.
1. Because the world is getting warmer, polar bears are in danger of becoming extinct.
2. As there weren't enough students, they closed the village school.
3. I really enjoyed the concert although he music was too loud.
4. When he got a creampie smashed in his face, everyone laughed.
4. While Paur was walking to the bus stop, he found somebody's wallet on the ground.
6. After Jackie is done with her chores, she will take out the trash.
7. If you study for the test, you will do much better.
8. Rex practiced his guitar until he could play the song perfectly.
9. Before we could get back to shore, it started to rain hard.
10. Whenever I saw him, he was always carrying a plastic shopping bag.