Food safety is important. Rules to stop people from food pollution.
I don't know________ they have passed the exam.
— I wonder if I can learn English well.—________. All things are difficult before they are easy.
— What did Tina say?— Sorry, I didn’t ________ what she said.
When you come across new words in reading, it is not a good idea to_______ in a dictionary at once.
— Jenny, do Chinese people celebrate Easter Day?— No. This is the first time I’ve celebrated festival.