I think ____necessary for us _____the birds.
Zhu Zhiwen’s never been to Hongkong, _______?
By the year 2015, all of China's museums will be free to enter. We_______visit anymuseum without paying.A. can b. need C. must D. should
—Which one do you want to buy, an iPod touch 4, an iPad 3 or an iPhone 5?—______. They are too expensive.
—Nancy, I bought you a new car, an Audi A8.—Thank you, dear. It's_______ what I want.
Tom didn't go to school_______ this morning because he overslept.