20. Choose the answer which correctly completes the sentence. "Did you go to Yellowstone for a vacation?" "I... to go, but my wife got sick three days before the departure." A) have been planning

C) have planned

B) had been planning

D) was planned

21. Choose the answer which correctly completes the sentence. Gold... near San Francisco in 1848, and the gold rush started the following year.

A) was discovered

C) has been discovered

B) was discover

D) they discovered