I have the following multiple-choice questions wrong, and trouble you help me explain. 1. —Who sings best in your class? —Mary _____. A. is B. does C. do D. sing 2. She _____ her pen in her room now. A. finds B. is finding C. looks for D. is looking for 3. What _____ you _____ tomorrow morning? A. are/going to do B. are/doing C. are/done D. have/done 4. It was not long before the water _____ cold. A. is feeling B. feels C. felt D. was feeling 5. The scientist _____ Canada and he will give us a talk when he _____ back. A. has gone to/comes B. has been to/will come C. has gone to/will come D. has been to/comes 6. He found his book this morning, but now he _____ his pen. A. loses B. is missing C. has lost D. lost 7. She ___ to her hometown several times. A. has been B. has gone C. went D. is going 8. Jane _____ some washing this time yesterday. A. is doing B. had done C. was doing D. did Thanks.