You ______ wear sports shoes when you climb a mountain.

Tomorrow David will have an important meeting, so he will _____a suit at the meeting.

Andrew’s singing ______ song．It’s _______ American song．

_______ have you been here? —I have been here for moths. [ ]

Which one do you want to buy, an iPod touch 4, an iPad 3 or an iPhone 5?—______. They are too expensive.