It is important to have your eyes examined regularly to check for any sign of eye disease that may not have any ________.

We should look up to him as a shining example of ________ to duty.

 The _____ in temperature is broadcast twice a day in the channel.

－How many passengers were in the plane?－It ______ 227, 153 people from the Chinese mainland and one from Taiwan ______.

(2011·上海高考)It's no use ________ without taking any action.