单选题For their own safety, household pets should be confined to their own yard.
单选题On the desert travelers often see _____ rivers and lakes.
单选题Being poor, he had never been to school. So as an illiterate, he is even _____ of the simplest words.
单选题The last half of the 19th century _____ the steady improvement in the means of travel.
单选题The first American president to be elected from the Republican Party was _____.
单选题It’ s time _____about the traffic problem downtown.
单选题Geysers are found near rivers and lakes, where water drains through the soil _____.
单选题The belief is the legendary lost continent of Atlantis may someday be found.
单选题As everyone knows, warm _____ is comfortable in the weather of snowstorm.
单选题“What authors do you like?” “Shakespeare is _____. ”
单选题Before the tourists set off, they spent much time setting a limit _____ the expenses of the trip.
单选题Sports, and not learning, seem to ______ in that school.
单选题Grain production in the world is _____, but still millions are hungry.
单选题We have been hearing _____ accounts of your work.
单选题Some educators try to put students of similar abilities into the same class because they believe this kind of ____ grouping is advisable.
单选题The senator agreed that his support of the measure would jeopardize his chances for reelection.
单选题Don’ t trust the speaker any more, since the remarks he made in his lectures are never _____ with the facts.
单选题Some philosophers insist that one way to _____ knowledge is through an empirical approach.
单选题It is strange that you _____believe his nonsense words.
单选题_____, dolphins have no sense of smell.