The No. 15 bus stops here, ______?
—Have all the students known that our class will visit the factory this afternoon? —Yes. Every student______ about it.
--Sorry, I overslept. I forgot to set the alarm. --Your clock ________. Perhaps you should buy a new one.
--There is somebody knocking at the door. Who________ it be? --I’m not sure. It ________ be a postman.
----How do you find your new classmates ? --Most of them are kind, but _________is so good to me as Bruce.
--Do you think the math problem was difficult? --Yes. But I could ________ make it.