Have you seen Mr. Black these days, Jack? —-Yes, I met him when I ________ in the street yesterday.

These pens are sale, and you’d better buy some.[ ]

The new student is ________ shy.

Betty, what are you doing now? —I’m waiting ____________ the bus. It takes me to school every morning.[ ]

The train arrived _____ Nanjing _____ 6.00 _____the afternoon of Sep. 13. [ ]