How long does it take us to go to your school from here?－It takes us hour or more to go to my school by bus.

He is old, but he ____ have gray hair.

Isoxygentheonlygas______helpsfireburn? [ ]

He was hoping to go abroad but his parents_________ that they won’t support him unless he can borrow money from the bank.

A year has ________ months, and December is the ________month.