—Must I turn off the gas after cooking ? —Of course . You can never be _______ careful withthat.

_____ I had done it I knew I had made a mistake.

We should’t only be satisfied with the present life, We are trying to look ______ and see what our future will be like.

— I did really well in the examination, Li Ke.—I did ______. I got full mark.

The attempt and insistence on purchasing the Diaoyu Islands by Japan will ______ harm    China-Japan ties．