— There's someone outside. Who it be ?— It must be Mary. She promised to come over at 8: 00.

I wonder if this is the computer you want______ .

It is hard for me to imagine what I would be doing today if I       in love , at the age of seven , with the library in my hometown .

---Good morning，Doctor Brown’s office.---Hello, this is Tom Smith. Could you please tell Doctor Brown I      ? My car       start.

Some aspects(方面) of a teacher’s job ______ be tiring, and teachers often ______ work at inconvenient hours.