—Can I pay the bill by check?—Sorry，sir．But it's the management rules of our hotel that payment     be made in cash．

 … Come to supper with us, Peter. … Great! I _______ bring a bottle of wine.

 If you _____ smoke, please go outside.

His shoes are muddy. He        be working in an office all day.

The art exhibition is really worth _______，and you’re sure to learn lot from it.