So , But , However

So, But or However ?
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 So, But, Therefore However để vào :
1. This is the shortest way to the city center,____ , it is not only way (However)
2.The boy was able to learn English,____ he is very lazy (But)
3. He didn`t attend the lesson,____ he could not do his homework.(So)
4, The rice is 5000dong per kilo,___ we bought 10 kilos (so)
5, Your son is heading to the right direction.____ I think you should encourage him to learn harder (Therefore)
6, It was midnight,____  the restaurant was still open (But)
7, It was midnight,____  they closed the restaurant and went home.(So)
8, He had writen to her many times but she didn’t give any reply,____ they had been out of touch over since (So)
9, We discussed the issue all day,____ we coudl not come to a final conclusion (But)
10, It started to rain hard. ____ we decided to stay at home to wacth TV (Therefore)
11, Hung studied very hard. ____ he still failed the exam (However)
12, Can studied hard. ____ she passed the exam easily (Therefore)
13, It was very cold last weekend,____ we still went for our picnic (So)
14, the flight attendant server dinner. ____ I didn`t eat (However)