---What beautiful exhibits! Do you mind my taking pictures of them? --- ______________. Please go ahead.
Samuel Clemens,______ Mark Twain, wrote many popular stories.
The old man used _____ in front of his house and he has got used to _______ like that.
You will ______ sooner or later if you keep working like that.
In the USA, the students who study business is more than _______ those who study agriculture.
—— Ann is in hospital.____ Oh ,really? I ______ know. I ______ go and visit her.