He goes to work early on workdays ______ Saturday and Sunday. [ ]

______ the students were when they heard the rock music!

Listen! Is Kitty in the next room? —- No, it ______ be Kitty. She has gone to Beijing.

）I’ll_________ advertisements after school so that we can tell people about the park clean-up.

The Voice of China is such a popular program with viewers has produced many a music-lover.