I read about this story in some book or other. Does it matter ________it was?
—Listen! There is a knock on the door. Who _____ it be?—It must be Jack. Just now I sent for him.
—What made her so happy?—_____ her son passed the driving test.
I would have come earlier, but I _____ that you were waiting for me.
During the opening ceremony, “Miss Smile” has won the hearts of Chinese Internet users after being caught _____ the same smile for nearly 20 minutes.
Things like eye contact and hand gestures _____ great importance in situations such as job interviews.