32. - He failed his exam again. - But what did you _____? Had he ever been working hard?
Play, often _______ as an activity for young children, is still important in the social development of teenagers.
Scientists generally agree that Earth’s climate will warm up over the next 50 to 100 years _________ it has warmed in the 20,000 years since the Ice Age.
---Ring me at 7 a.m.? ---No, not that early! I _________.
________, more than 200 houses and buildings are heated by solar energy, not to mention the big cities.
Results from a recent research indicate that ______ daydreaming is ______ means of relaxation.