To keep healthy, Professor Johnson ____ cycling as a regular form of exercise after he retired.
Even if the treatment ________, there is still no magic pill for the patients in the last stage of AIDs.
In that supermarket on sale is a new type of computer, _____ low price makes it attractive to the students from poor families.
---Did you have any trouble with the western customs ? ---_________ to speak of.
The boy promised ______late for school again.
______ interests me most in the world is the natural beauty of Guilin.