---Who is the tallest boy? ---It ______ be John. John is of medium height.
_____ you read the sentences , _____ mistakes you’ll make.
---Can you lend me the dictionary ________the other day? ---No problem.
—Isn’t that Ann’s husband over there? ---No, it _______be him. I’m sure he doesn’t wear glasses.
A tourist will easily lose his way in Shanghai_____ he has a map or a guide.
After earthquake, ________people were homeless.