— _______ is the plane taking off?—In twenty minutes.A. How far B. How long C. How soon
I find it difficult _______ up Mount Tai.
When people want to relax themselves, they prefer _________ TV rather than _______ newspapers.
Albert Einstein was _______a great scientist.
We were all _______with the _______trip to Dalian.
Every year lots of trees ______to make our country more beautiful.