We must do everything we can _____ our earth cleaner and safer.

－Must I go and get some water now－No, you __________.

Did you return the book to me Why can’tI find it anywhere — ________. You were writing a letter atyour desk at that time.

Where’s the Sunshine Park- It’s _______ east of the Lake Park, just in_______ front of Sunshine Middle School.

Have you ever dreamed of staging a concert, ________ thousands of people are applauding and appreciating your music?