--Who is the man over there? Is it Mr. Li ?--No, it _______ be him. Mr. Li is much taller.
I _______ you are well.
Who do you often do the shopping _______?
There _______ an apple and two oranges on the table.
It’s so cold today. Don’t keep the window ___________.
________ three years and a half since they began to build the great bridge.