______________(熬夜) too much is not good for our health.
Shall we invite the famous singers to our food ____________(节日)？
The pollution in this town used to be very serious, people _____________ saw the blue sky ____________(既不……也不) breathed fresh air.
Yu Dan ________________ (被看作) one of the best speakers in our country.
We should study hard and _________________(为……作贡献) to our country in the future.
