I argued ________ my good friends yesterday. What should I do?[ ]

What about going by plane? —Good idea! I feel really_______ because it’s the first time for me to take a plane!

Mom,where is David?—He is working _____ that difficult math problem in his room.[ ]

Has the match started?– Finished! Guo Jingjing_____ it.

Please give this book _________ Lin Li. It’s his.[ ]