With the final exams coming, Mark, the top student in our class, is not worried about Chinese, and _________ English.
________ energy is generated from natural resources—such as sunlight, wind, rain, tides and so on.
Effective measures have been taken to prevent _______pollution.
It worried her a bit ____ her hair was turning grey.
_______you come or not is up to you.
_________is going to do the job will be decided by the Party committee.