—Who is the girl standing over there?— Well, if you _____ know, her name is Mabel.
------ Why does the lake smell terrible? ------ Because large quantities of water _________.
I ________ through that bitter period without your generous help.
By the time Jack returned home from America, his son __________ from college.
She was good at physics _________she found it boring.
The experiment show that proper amount of exercise, if ________ regularly, can improve our health.
—Who is the girl standing over there?— Well, if you _____ know, her name is Mabel.—Who is the girl standing over there?— Well, if you _____ know, her name is Mabel.
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