单选题 It is true that human beings have had war ______ throughout history; nevertheless human civilization has managed to survive.

单选题 It's long been proven that we can ______any project if we break it up into small pieces and do the project one piece at a time.

单选题 ______ in the north of the country, the town has a dry and cold climate all year round.

单选题 Traffic jams often build up when drivers ________ to see what happened in a crash.

单选题 Birds have an ______ to build nests.

单选题 We set out to find the truth behind the ______ of the scientist's disappearance.

单选题 There is now a growing ______ of the importance of recycling among the residents in our neighborhood.

单选题 ________ much he wanted to give her a helping hand, she could not bring herself to accept it.

单选题 In order not to hurt Mary's feelings, please don't ______ the incident again.