-You've booked a four o'clock flight.-What chance ________of taking an earlier plane?
The beef is too expensive. I won’t buy it _____.
The medicine _____ natural plants.
----- I’m going to the States. ----- How long ______ you ______ in the States?
I don’t think _____ possible to master a foreign language without much memory work.
----- My father will be here tomorrow. ----- Oh, I thought that he _____ today.