.The plane ＿＿＿＿＿ at 7：00 p.m., so I have to be at the airport by 6：40 at the latest.
| A．has left | B．is to leave |
| C．will have left | D．leaves |
This is ______ that dog.
| A．as a big dog as | B．as big a dog as |
| C．a as big dog as | D．a big as dog as |
He worked hard and achieved what he set out to do, but ________ what he had owned, including his health and his marriage.
| A．at the mercy of | B．at the risk of |
| C．at the cost of | D．at the service of |
It saves time in the kitchen to have things you use a lot________easy reach.
| A．near | B．upon | C．within | D．around |
—It’s difficult to tell this picture from that one.
—Yes.The differences between the pictures are very________.
| A．broad | B．narrow | C．slight | D．impressive |
-Mary, would you like to come to my birthday party? -_____.
| A．Of course, you could | B．Sure. Go ahead |
| C．Sorry, you may not | D．No, you mustn’t |