---Do you know who first _____ electricity?

---As we all know, Benjamin Franklin did.

---Oh, that's just my missing book. Where on earth was it?

---It ______ off the table into the corner.

---I wonder why you must choose Jones to be your salesgirl?

---I think she is the ________ person for the position．

---Hi, Mary, I'd like to go to the supermarket, do you have anything ________?

---Oh, would you be so kind as to buy me some vegetables?

---Will you go to the party tomorrow?

---If you will, ________.

---I believe ________ you've done your best and ________ things will improve.

---Thank you.

---What have you ______ hydrogen, Mary?

---Balloons.

---Hey. Taxi!

---______.

---I want to go to Park Street.

---What happened to that saleswoman?

---I don’t know．She ________ here for a long time．

---Why was our foreign expert unhappy yesterday?

---News about the terrorist explosions in London ______ an attack of homesickness．