You must concentrate _____ your study not on your clothes.
—I saw Jane on the street just now.—It ______ be her. She went back to Canada yesterday.A. can’t B. mustn’t C. needn’t
—I’m sorry to have kept you ______ for such a long time.—It doesn’t matter.A. wait B. waiting C. to wait
Jack had to stop working though it was ______ his own wishes.A. on B. for C. against
In parts of India, people use their fingers to ______ the food.A. send up B. build up C. pick up
—How are you feeling now?—I’m feeling much ______ than before. Take me to the hospital, please.A. bad B. worse C. worst