___________ many times, but he still couldn’t understand it.
—Bob, are you free at the moment? I have to ask you some questions.— __________.
You are __________ to hand your paper in before the class is over.
We have planted some more flowers around the campus, which __________ the beauty of the whole school.
—Personally, no supper does no good to weight loss.— __________. As a matter of fact, it does harm to your health.
Whoever has __________ sense knows that smoking is harmful to people's health.