.They served raw vegetables with the hamburgers and boiled the potatoes ________ fried them.

While she_____ on the phone, a man walked into herroom.

Good parents turn every meal into a special occasion they can use to discipline their kids.

While we are developing agriculture and industry, we must prevent the earth ______.

Isn’t that Ann’s husband over there?—No, it ______ be him-I’m sure he doesn’t wear glasses.