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

单选题 Our boxes are in _________and should arrive tomorrow.

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

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

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

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

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

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