I forgot to keep the milk in the refrigerator, so it went bad.
A.The milk went bad because I forgot to keep it in the refrigerator.
B.
C.The milk went bad until I forgot to keep it in the refrigerator.
D.The milk went bad yet I forgot to keep it in the refrigerator.

His father died at a young age, so he had a difficult childhood.
A.He had a difficult childhood so that his father died at a young age.
B.He had a difficult childhood because of the fact that his father died at a young age.
C.He had a difficult childhood owing to his father died at a young age.
D.He had a difficult childhood though his father died at a young age.

The air in the city is polluted, but people like to live there.
A.People like to live in the city despite the air is polluted.
B.People like to live in the city though the air is polluted.
C.People like to live in the city seeing that the air is polluted.
D.People like to live in the city but the air is polluted.

He gave me his address. He wanted me to visit him.
A.He gave me his address so that I would visit him.
B.He gave me his address because I would visit him.
C.He gave me his address though I would visit him.
D.He gave me his address yet I would visit him.

I did not want to hear what they were talking about, which is why I put the music louder.
A.I put the music louder in order to not hear what they were talking about.
B.I put the music louder although I didn’t want to hear what they were talking about.
C.I put the music louder but I didn’t want to hear what they were talking about.
D.I put the music louder so as not to hear what they were talking about.

Cars cause pollution but people still want them.
A.Because cars cause pollution, people want them.
B.
C.Cars cause pollution although people want them.
D.Cars cause pollution because people still want them.

The street was crowded and narrow, he couldn’t drive fast.
A.He couldn’t drive fast owing to the street was crowded and narrow.
B.He couldn’t drive fast due to the street was crowded and narrow.
C.He couldn’t drive fast although the street was crowded and narrow.
D.He couldn’t drive fast due to the fact that the street was crowded and narrow.

He did not want anybody to know his real identity, so he gave them a false name.
A.He gave them a false name even though nobody knew his real reality.
B.He gave them a false name but nobody knew his real reality.
C.He gave them a false name so that nobody knew his real reality.
D.He gave them a false name in order to nobody knew his real reality.

He was late for school because his bike was broken.
A.He was late for school because of his bike was broken.
B.He was late for school owing to his bike was broken.
C.He was late for school though his bike was broken.
D.He was late for school now that his bike was broken.

She learns Chinese. Her aim is to work in China.
A.She learns Chinese since to work in China.
B.She learns Chinese due to work in China.
C.She learns Chinese for work in China.
D.She learns Chinese to work in China.