-- My brother bought me an iPhone 5, but I don’t know __________. Can you help me? -- Let’s read the instructions.
There are five people in the room, but I know _____.
Don’t give up _____ you will never succeed.
Trees can stop the sand _____ towards the rich farmland in the south.
—Can’t you stop making so much noise? I really can’t _____ it.—I’m terribly sorry for giving you so much trouble.
He said that he _____ to Canada a few years ago.