—You look tired,Mike.—Oh,I stayed up last night,________the final of the Voice of China on TV.
Many students today suffer from ________ problems, since they are under too much pressure.
________ energy is generated from natural resources—such as sunlight, wind, rain, tides and so on.
Effective measures have been taken to prevent _______pollution.
-- I’m thinking of the test tomorrow. I’m afraid I can’t pass this time. -- ______! I’m sure you’ll make it.
After that, he knew he could ________any emergency by doing what he could to the best of his ability.