You must turn off the gas after cooking. You can never be ______ careful withthat.

_____ three influenza type A virus subtypes(子类型) have been found in pigs.

—Did all of the boys go to the cinema?—No.They __________ went to the Internet bar instead.

In the bubble years, lending standards slipped ______,allowing   many people to put far too much of their income into paying for their housing.

There was such a long queue for coffee at the interval that we_________gave up.