A study shows that students living in non-smoking dormitories are not likely to the habit of smoking.
Look out! Don’t get too close to the house __________ roof is under repair.
Women __________ drink more than two cups of coffee a day have a greater chance of having heart disease than those __________ don’t.
. The biggest problem for most plants, which ___ just get up and run away when threatened, is that animals like to eat them.
In crowded places like airports and railway stations, you __________ take care of your luggage.
The teacher __________ have thought Johnson was worth it or she wouldn’t have wasted time on him, I suppose.