It was playing video games that took the boy too much time that he          have spent learning．

 If you want somebody to go window shopping with you, why not try calling Marie? —she ________ be home by now.

--Listen! Kate is playing the piano in the next room.　　--It _______________be Kate. She has gone to Hangzhou to visit the Cross-sea Bridge.

— John, do you have any plans for this weekend?— I’m not sure. I _______ go fishing with my uncle.

--Let’s go to the Tian’anmen Square by taxi. --Oh, it’s not far from here. We_______ take a taxi.