Traveling around big cities by taxi can cost a lot of money, but it’s usually to take the underground train to most places.

The Internet is a wonderful discovery,________of great significance to people’s lives.

We’re programmed to want more food, we won’t have a chance to eat tomorrow．

I bought this dictionary two weeks ago. —-You mean you __________ it for half a month.

________ Greens are on _________ visit to the Great Wall.