So far a lot of tall buildings ________ in our city.

1. A.
   are built
2. B.
   were built
3. C.
   have built
4. D.
   have been built

So far, the moon ________ by man already.

1. A.
   is visited
2. B.
   will be visited
3. C.
   has been visited
4. D.
   was visited

 So far this year, many new houses ________ in Wenchuan with the help of the government.

  A. build          B. are built         C. will build        D. have been built

 So far this year, many new houses ________ in Wenchuan with the help of the government.

  A. build          B. are built         C. will build        D. have been built