Cyrus is so successful that she made Forbes’ Celebrity 100 list last year ___she was number 35.
I hate ______ when people call me by my nickname (绰号).
Can you see that building ______ by trees? That’s ______ we study.
Sir, you ________ take this seat. It’s just for the old.
______ life began on earth is one of the biggest puzzles that scientist found hard ______.