Thefreezingpointisthetemperature__________waterchangesintoice.

He has a great interest in ______ history, especially ______ history of the Tang Dynasty.

Finally, Ben gave up his big apple to Tom ________ a chance to paint the wall.[ ]

What about the student in your class, Mr. Wang?— The doctor said that sleep caused him poor memory and poor concentration.[ ]

As the final exam is coming, the teachers are busy ___________ the test papers.