完成句子；根据汉语提示，完成句子，一空一词，包括缩写词。
1.我21岁时开始教英语。
I __________ ________ __________ English at the age of 21.
2. 这位顾客认为土豆不够薄。
The customer thought the _________ ___________ thin enough.
3.学生应该尽力避免上课迟到。
The students should try to _________ ____________ late for class.
4. 英语在全世界被广泛使用。
English _______ _______ ______ in all parts of the world.
1. took up learning
2. potatoes weren’t
3. avoid being
4. was widely used
___________