John opened the door. There he had never seen before.

With real estate （房地产）______ in economy, a lot of rich farmland had to ______ new houses and offices in the area.

Mike and I to the zoo and some tigers there yesterday.

There is __________ “c” and _______“l” in the word “colour”. an, an

The project ____ Wang Lin’s life is one of the many government programmes ____ improving the situation for the poorest people in China [ ]