单选题 There is no doubt __________ all the flights have been canceled because of the snowstorm.

单选题 Staying in a hotel costs __________ renting a room.

单选题 This may have preserved the elephant from being wiped out as well as other animals __________ in Africa.

单选题 There is no __________ in the world for her children.

单选题 He narrowly escaped __________.

单选题 __________ all behavior is learned behavior is a basic assumption of social scientists.

单选题 Before every presidential election in the United States, the statisticians try to guess the proportion of the population that __________ for each candidate.

单选题 Paper produced every year is four times __________ the weight of the world’s production of vehicles.

单选题 Sir Dennis, who is 78, has made it known that much of his collection __________ to the nation.