If there are ______ trees, the air in our city will be _______ cleaner.
It's the first time for meAmerica.
Could you tell me when ___________?
-Lily, are you ________ than Lucy? -- I guess so. But I’m smarter than Lucy, and I’m ________ of the two.
It takes ________ half an hour ________ on foot.
____she is tired, _______ Han Mei doesn’t stop working.