Good friends are like stars. You don’t always see them, ______ you know they are there.
The street was very busy because there was ________ traffic.
—I'm feeling so tired now. —stop and have a rest?
The girl is only two years old. You can’t leave her ____________.
The ticket ______ him ¥20.And flying to the USA ________him two days.
Millie has_____free time than Sandy because she has______work to do than Sandy.