Many of his classmates came to his birthday party; it was a great success to him.

–You are really crazy about music!Sort of I always find in music _____ peace which ismissing in _____ world full of challenges

HI don’t like.

Having checked the doors were closed, and ___ all the lights were off, the boy opened the door to his bedroom.

I listened to Professor Chen-Ning Franklin Yang’s lecture about his study and physics, but I failed to get its key ______ .