_________ is known to all，good friends _________ happiness and value to life

It was the first time in my life that I the Great Wall. You can’t imagine how excited I felt!

tional park has a large collection of wildlife, _________ from butterflies to elephants.

Where did you first meet your boyfriend?— It was in the department store ______ he worked [ ]

Mike, why did you make no reply to me when I called your name in the street just now-Sorry, Tom. I_______ to my mother on the phone.