It is a good time _______.

May I ___________your storybook —Sure. But please don’t _______ it ________ others.

He ________ that he ________ himself on the playground enjoying the sun.[ ]

On weekends I like to with my friends in the supermarket.

The research on the new bird flu virus vaccine is challenging and demanding. Who do you think can do the job?–________ my students have a try?