We may find that learning a foreign language does not have to be________learning our mother tongue,but can in fact be twice ________.
—Jim is very sick these days. He coughs so badly.—In my opinion, he really ________ listen to the doctor and cut down on smoking.
—Where did you get this book?—I picked it up from a secondhand bookshop if you ________ know.
When Harry was at college, he ________ go to the reading room after supper every day.
Don't be angry with us. We ________ with you together, but we were busy with our final reports when you called in.
Your teacher ________ very angry at that moment because you talked back to her like that.