—Doctor, it seems you like to work with animals.—Yes, I think animals should __________ as our friends.
---May I look at the menu for a little while?---Of course, ______ sir.
Considering his health, I advise him to ______ an hour or two each day to work out.
Riding bikes has advantages __________ driving cars ________ many aspects.
How can we get this language point _____ to the students.
We' ve published large quantities of books. This year___ we've published three million.