We have worked for three hours. Now let's stop _________ a rest.
–Excuse me, _____ ?--It’s windy.
--_____ with you? --I have a score throat.
–Excuse me, Mr. He, are you free? Lin Tao and I want to tell you _____. –Sure.
He is finishing _____ a funny story. And he is thinking about _____ to Beijing for a vacation.
David has a stomachache. _____ .