—Could you teach me how to download songs from the Internet?
— . It’s easy to learn.
| A．No problem | B．Never mind | C．Not at all | D．Don’t mention it |
The rice made _____ possible to produce one-third more of the crop in the same field.
| A．that | B．this | C．one | D．it |
I regret ______ you that you will miss your flight if you don’t hurry up. You have only twenty minutes to go.
| A．to tell | B．telling | C．having told | D．to telling |
. ______ hard. You are sure to succeed!
| A．Working | B．Work | C．Worked | D．To work |
There was a time _____ hunger was a disturbing problem in this area.
| A．how | B．when | C．that | D．why |
His _____ expression suggests that the news he read just now must be _____.
| A．excited; exciting | B．excited; excited |
| C．exciting; exciting | D．exciting; excited |