Food safety is ________ important, so our government spares no efforts to prevent food being polluted

Look! That man looks like Mr. Brown.—-It _______be him, for he _____to America.

―Do you still live in the countryside?―YesI don’t want to leave the house,______ it is very shabby

“ Isn’t that Tom playing basketball” “ It______ be; he fell off the ladder yesterday and got badly hurt.”

We never doubt __________Bill is honest. Because henever tell lies.