单选题 If darkness or night __________, it becomes dark and day changes to night.

单选题 The foundations will have to be __________ to prevent the house from sinking further into the ground.

单选题 They're ______ to socialize with a very small circle of people.

单选题 She's too smart to fall into the ______ of working without pay.

单选题 They were making a __________ amount of noise last night.

单选题 She felt she needed time to __________ on what to do next.

单选题 Consultants who have easy access to the president are those who have _______ the president.

单选题 In the second experiment they __________ a very clear result.