we must know if a car is traveling faster then it t-------longer to stop

we must know if a car is traveling faster then it t-------longer to stop .If we want to know the development of our country,we must learn__well(history还是politics) We must try our best____ (learn)English If you don't know how_____(spell)new words,lokk them up in a dickitionary Passage 1We know that we have to pay for what we get.If we buy food,we have to pay for it.If a doctor treats us,we know there will be a bill to pay.These are private bills.But there are public bills that must be paid.Public bills are paid for by the 现在要赏金20 if we go by car,we must know the t( )r( )的括号应该填什么if we go by car,we must know the t( )r( )的括号应该填什么 OK.I know In a word,whatever we do that we must insist If we find a fire,we must call___________A.120 B.119 C.112 D.122 You must know the traffic ______ if you walk ____ a city. 阅读表达If you have studied a foreign language,you must know how difficult we must find a As a driver,we must know what the traffic signs mean in order to ______________________. We did not know why they ------leave A had B had to C must Dmight We did not know why they ------leave A had B had to C must Dmight 根据短文内容回答问题.How can we learn English?We are learning English ,but how can we learn English well?A student can know alot about English ,but maybe he can`t speak English well.If you want to know how to swim,you must get into the wate Why are we always tired,do you know?Firstly if we can’t sleep 1 ,Why are we always tired,do you know?Firstly if we can’t sleep 1 ,we will be tired.But we are often too 2 .We can’t finish our work in the day and we must do it 3 night.We go to be Then we must know that we will love again 英语翻译How can we learn English well?We are learning English now.But how can we learn English well?A student can know a lot about English,but maybe he can’t speak English.If you want to drive a car,you must learn to drive a car and practice it if we want to learn how to love we must proceed in the same way we would if we wanted to learn a...if we want to learn how to love we must proceed in the same way we would if we wanted to learn any other art.这句话怎么有两个if?求高手翻译