—Can I call you back at two o’clock this afternoon?—I’m sorry, but by then I _____ to Beijing. How about five?
On hearing the sound, the birds flew away in every _____.
_____ foreign guests come to our school for a visit every year and we exchange _____ information about education.
This is a very interesting book. I’ll buy it, _____.
This is not very good; I’d like the same one _____ you are using now.
The part he _____ in the movement was important.