If better use is ____ of your spare time, you’ll make great progress in it. [ ]

Did you see a child dressed in red pass by?—-Sorry, I _____ the poster on the board without noticing anyone

My command of English is notyours.

The more ______ we take the safety standards, the further we can speed up the development of the school bus industry.

no means shall welet out the secret.—No, nocase shall we.