---Will someone go and get Dr．Smith?

---He’s already ______．

---You may find the key to the problem at the back of the book.

---Ah, it's so simple! I wonder why I ______ out that.

---Susan looks unhappy today．

---Yes, but she can’t tell what it is ______ is bothering her．

---Dad, you promised!

---Yes．But ______ broke the promise first?

---What do you think of ______ here so far,Rick?

---Well,I really enjoy meeting people here and exchanging lessons is also interesting．

---How long does it take to get there?

---The road is less crowded today,I think we ______ arrive before dark．

---Have you heard of this new brand of computer, Mike?

---Yes, of course and I've decided to buy ______.

---I haven't seen her for 2 days.

---It is not like her ______ 2 days of classes.

---We missed you at this morning's meeting, Diana.

---______, but if I hadn't had to meet a friend, I would have been there.

---It'll take at least 2 hours to do this!

---Oh, _______ ! I could do it in 30 minutes.