I wonder________ he will come back tomorrow.
Listen carefully, _______ you can’t hear what the teacher is saying.
I don’t know what ________ of students in that school is, but you can see there are _________ of bikes and e-bikes outside the gate.
— It is said that Mr Jin was elected headmaster of the new school.— He is _____ hardworking that it is no surprise for him to get ______ post.
My teacher used to _______ a bike to school, but now he is used to ________ a car to work.
When he saw the poor conditions in the school, he decided to ______ some teaching instruments for them.