单项选择题
The Johnsons（）the house before they decided to buy it.
A.looked out B.looked over C.looked after D.looked on
单项选择题 It is（）practice to bring a present to the hostess when one is invited to dinner.
单项选择题 She was a simple, （）and hard-working woman.
单项选择题 In the bitter cold, the explorers managed to（）despite the shortage of food.
