“ ______ as often as you can,” our English teacher often tells us, “ you will make rapid progress.”

（2014年福州市高三适应性练习）30. In general, _______ energy, we turn off the lights for Earth Hour on the last Saturday in March.

. He regretted______ to the lecture the day before. 

There will be more than 750 projects ____, creating nearly 40,000 jobs starting this summer, including 15,000 in a Youth Conservation Corps.

Mr Smith, _____ of the _____ speech, started to read a novel.