The researchers found clear and convincing evidence _________ happiness is the key when it comes to better health and longer lives.
Many people have donated that type of blood; however, the blood bank needs _____.
_______ with care, one tin will last for six weeks.
There is------in his words. We should have a try.
George said that he would come to school to see me the next day, but he ______.
You might wonder how it________to live without eating for so many days.