We must be p________ if we ask others questions.
Kate r________ a letter from her grandparents three days ago.
She is an e________ teacher, so we all like her class.
you must be careful to c________ the road. It’s dangerous.
The teacher looks very angry. Do you know what h________?
She was very___________(紧张) while she was having a test.
It’s not right for you  ___________(抄) others’ homework.
She had a very unusual _____________(经历) on last Sunday.
She wants to be a _________(科学家) when she grows up.
If you have a ____________（机会）to go to America, take it.