Do you know the boy________ is sitting next to Peter? — Yes. He is Peter’s friend. They are celebrating his ________ birthday.

We didn’t find ______ in the picture. Would you please tell me?

You’ve chatted for nearly two hours. — Yeah. We’re talking about the things ______ happened yesterday.

How do you study _____ a test?—I study _____ working with a group. [ ]

We were greatly ______ by the program performed by Xiao Shengyang on CCTV.