=>
1. Because the world is getting warmer, polar bears are in danger of becoming extinct.
-> Because S V: bởi vì
2. As there were not enough students, they closed the village school.
-> As ~ Because
3. I really enjoyed the concert although the music was too loud.
-> although S V: mặc dù
4. When he got a creampie smashed in his face, everyone laughed.
-> when QKĐ, QKĐ
5. While Paul was walking to the bus stop, he found somebody's wallet on the ground.
-> while QKTD, QKĐ
6. After Jackie is done with her chores, she will take out the trash.
-> after: sau khi
7. If you study for the test, you will do much better.
-> câu đk loại 1: If S Vs/es, S will V
8. Rex practiced his guitar until he could play the song perfectly.
-> until: cho đến khi
9. Before we could get back to shore, it started to rain hard.
-> before ~ trước khi
10. Whenever I saw him, he was always carrying a plastic shopping bag.
-> whenever ~ bất cứ khi nào