Look！The man at the gate ____ be our teacher. He is always standing there every morning.—No，it ________ be him. He is having a meeting in the office now.

is surprising to us is that Tom can speak English fluently as though he were a native speaker.

What time do we have to be at the gate of the museum? —______ the visitors begin to check in

Here are some potatoes, please ________.

y the advances in technology, manyfarmers have set up wind farms on their lands.