He has never cheated  ________the exams.

We can’t do it best if we don’t ______________(完全地)put our heart into our study.

I’d like to __________(补充说)that we are pleased with the test result.

People often see lightning before t________ in the stormy evening.

We human beings should try our best to live in harmony with n________.

Knowledge is p________, which proves to be true.

Because he didn’t finish the work on time and was fired by company, he was very u______ about it.

The mother tried to c________ down her crying baby.

She doesn’t want to set down a s________ of facts in a diary as most people do.