Mrs. Green often quarrels with her husband because her opinions about how to educate their single son are not with her husband’s.
Every time she was in trouble, she went to him for help, as he said he ________ do anything for her.
—Where did you get The Frog written by Mo Yan?—I picked it up from a bookshop online if you ________ know.
When I lived with my roommates in the university, we ________ often talk into the night.
________ your letter, I would have set off two days ago.
You ________ in person; a telephone would have been enough.