we completely differ from each other in character，we are still great friends

Your sister’s plan is not quite practical.Why not try to persuade her to give it up?—My sister is very stubborn，so it is________to try to change her mind

He has made another wonderful discovery,___ of great importance to science.

You have no chance of getting the positionI’m afraid you _____ your time if you apply for it

What are the police doing?—They are _________the mountain ___________ the escaped prisoner.