根据汉语提示填写单词,完成句子

1. Many students find it very difficult to                  (记住) English words.

2. He put on his coat and went away                  (快) as soon as he heard the ring.

3. I usually learn English words by making                 (抽认卡)．

4. I often help the people in ________ (困境)．

5. I don't like learning _______ (语法)．