根据句意及汉语提示在横线处填上恰当的单词，使句子意思完整，语法正确。
1. It doesn't _______(有关系)if I miss my train, because there's another one later.
2. Jenny is poor in English．She can hardly make a_______(完整的；完全的)sentence.
3. I didn't _______(认识到)how late it was until my mother got angry with me.
4. All the runners are trying to run as_______(快地)as they can to win the race.
5. My little sister is_______(害怕的)of the dark, and she never goes out at night.
6. I joined the art club last _______(学期). 1 learnt a lot and now I can draw well.
7. There are many chances and________(挑战)in modern society. We should face them
bravely.
8. We bought an old car, and it was the_______(问题、疑难等的解决)to all our problems.