Yesterday I lost my pencil sharpener. I couldn’t find_______.—Oh, it’s a pity. You’d better buy ________ this afternoon.

Peter and I ________ in the same class. ________ are good friends.

I was told to meet Mr. Green at the airport. But I don’t knowhe will arrive.

The children have six ______ classes every weekday.

______ comes after (在……后) seven.