Without your help, I ＿＿＿＿the exam last term.

Who is playing the piano in the classroom —_______ must be Susan. She plays the piano after school every day.

It is reported that Beijing and Zhangjiakou（张家口）will compete to host the 2022 Winter Olympics, which will _____ China’s social development.

In the classroom, _______ a teacher’s desk, two blackboards and four windows.

The teacher spoke so fast that it was hardfor the students to ______ what he was saying