---You should have thanked her before you left. ---I meant ____ , but when I was leaving I couldn’t find her anywhere.
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 ______.