单项选择题 Friendship helps us understand （）we are, （）we need each other and （）we can do for each other.

单项选择题 One day Chuck is on a flight （）the Pacific Ocean suddenly （）his plane crashed.

单项选择题 —It was very crowded （）I went there last night. —I don't care whether it's crowded or not. I'd like to see it anyway.