1．Make up your mind, or/otherwise you will miss the valuable chance.
2．I was feeling hungry, so I made myself a sandwich.
3．There is only one more day to go before your favorite music group play live.
4．(2018·黄冈模拟)Not until we succeed in letting wildlife live in peace can we smile in relief.
5．Though/Although/While scientists have learned a lot about the universe, there is much we still don't know.
6．Although he once felt like giving up, he now has the determination to push further and keep on going.
7．The meaning of the word “nice” changed a few times before it finally came to include the sense “pleasant”.
8．It was the middle of the night when my father woke me up and told me to watch the football game.
9．Even if/though the forest park is far away, a lot of tourists visit it every year.
10．If we persist in this practice, gradually we'll learn how to express ourselves in English.
