However and Therefore 
You can use 'however' to express contrast. It is usually offset with a comma.It means "despite that".
Paul decided to go to Kenya. Steve, however, went to Dorset.
Pete went fishing today; however, John went fishing yesterday.
"Therefore" means "for that reason", and is also used with a comma.
Margaret moved last week; therefore, she didn’t graduate with our class.
Sam and John left before science today; therefore, they didn’t take the quiz.
Now you can write "however" or "therefore" to fill the gaps:
1. I don't like salads. , I like vegetables.
2. It was raining. , she took her umbrella.
3. He went to London. , she didn't see the Big Ben.
4. He went to London. , she saw the Big Ben.

5. She loved her boyfriend. , she didn't buy him a present for St Valentine.
6. She loved her boyfriend. , she bought him a present for St Valentine.
7. They loved animals. , they had a dog, a cat and a rabbit.
8. They loved animals. , they didn't have any.
9. He was very fat. , he didn't usually eat a lot.
10. He was very fat. it was difficult for him to find nice clothes.
11. I won the lottery. , I bought a beautiful car.
12. I won the lottery. , I didn't change my old car.
13. My brother loves sports. , he doesn't play football.
14. My brother loves sports. , he plays football, basket, rugby and golf.
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