I don’t think Lily can sing _______ Lucy.—I disagree. I think Lily can sing ______ Lucy.

Look! They ________ in the hallway.

My favorite animals are koalas. They usually sleep _____ the day, but _____ night they get up. [ ]

Are you going to Beijing _____ plane? —No. I’m going there _____ a train. It takes only four hours.[ ]

We usually work _____ the day and sleep _____ night.[ ]