We may find that learning a foreign language does not have to be________learning our mother tongue,but can in fact be twice ________.
—Are you going to the concert next week?—I’d like to, but I ______ an exam then.
—I didn’t know you play the piano. It sounds wonderful!—Thank you! I ______ it when I worked in UK.
We are going to the theater tomorrow ______ all the tickets are sold out.
Once ______, the book will surely attract readers’ attention since it is related to people’s health.
—I am worn out now. I stayed up last night to finish the report.—Oh? You ______. The professor asked us to hand it in next week.