These pens aren’t ___.They are ___.
____ you are, ____ mistakes you will make in the exam.
—Can you tell me ____ we will have a holiday for May Day?—Yes, we will. We will have a ____ holiday.
There are more and more foreigners coming to China. So I think English is ____ useful than before.
Liu Xiang is ____ popular ____ many students are talking about him in and out of school.
We all want to know ____ the famous writer will come to our school or not.