Almost all bio-film system work well for de-nitrification, as long as oxygen transfer can be kept to a minimum and plugging does not occur. ( )

The American society as a whole operates on the basis of well-kept schedules.

中国大学MOOC: I didn’t sleep well last night, but it was not my own ________, because the plane kept making noise.

I didn’t sleep well last night, but it was not my own ________, because the plane kept making noise. A: mistake B: fault C: trouble D: problem

Television ______. A: has distorted the propose of slogans B: has kept consistent the nature of human interaction C: has made political images personal and shorter D: utilizes slogans well

The society ____________ operates on the basis of well-kept schedules. A: in advance B: in person C: at the most D: as a whole

It ______ snowing all afternoon. A: kept on B: kept after C: kept out D: kept over

These magazines ______ in the library for a long time. A: have kept B: had kept C: have been kept D: were kept

Most of his savings ________ in the China bank. A: has been kept B: is being kept C: have kept D: have beent kept

—— You've kept silent all afternoon!—— I'm feeling ______ blue today. I didn't do well in the last exam. A: in any way B: in terms of C: sort of D: a kind of