根据汉语意思，完成下列句子,每空填一词。
If you are tired, you’d better________ ________ (躺下) and take a rest.
What are you going to be when you________ ________ (长大)？
Don’t spit________ ________ (当众).
We will play basketball________ ________ (代替) playing soccer.
The doctor always ________ ________（给……做检查）his patients carefully.
你不得在教室乱扔垃圾。
You must not             litter           in the classroom .
由于脚伤刘翔不得不放弃比赛。
Liu Xiang had to ________  _________ the race because his foot was hurt.
昨晚孩子们直到做完他们的家庭作业才去睡觉。
Children ________ go to bed ________ they finished their homework last night.
熬夜太晚对身体健康有害。
___________  __________ late is bad for health.
我们该做什么来与SARS 作斗争呢?
What            we do         fight SARS ?