Studies have shown that the right and left ear sound differently.
30.---- Do you think it's a good idea to make friends with your students?---- _____ , I do. I think it's a great idea.
29.---- I wonder how much you charge for your services.---- The first two are free ____ the third costs $30.
28.She’ll never forget her stay there ________ she found her son who had gone missing two years before.
27.My uncle’s house in the downtown area is much smaller than ours , but it is twice _______ expensive .
26.Not until I came home last night ________ to bed.