Which of the following sentences uses prepositions correctly?
a. kevin was relieved the meeting was over by noon.
b. where is my science textbook at?
c. maryann was glad to have her dentist appointment over with.
d. my mother is always asking me where i am going to!

The best answer is A. Kevin was relieved the meeting was over by noon.

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onto a large boat, and mark the water level that the boat sinks to. then, take the elephant out and put a bunch of marked weights onto the boat until it reaches the same water level. add up the masses of the weights to get the weight of the elephant.

the answer to the blank is recite