You never know how much difficulty we had _______ the problem .Luckily, we managedto solve it with Mr Zhang’s help.
— When ______ he buy his bike? — Two years ago.
I can’t play basketball after school because I ______ do my homework first.
— ________ does it take to get to school? — It takes about 15 minutes.
Listen! Who ______ in the classroom?
— What does your English teacher look like? — She medium height.