【单选题】The fact has worried many scientists _____ the earth is becoming warmer and warmer these years.
【单选题】____________ spring, the weather is getting warmer and warmer. [ ]
【单选题】The fact has worried many scientists______ the earth is becoming warmer and warmer these years. [ ]
【简答题】________ is known to us all that the world weather is getting warmer and warmer.
【单选题】The fact has worried many scientists ________the earth is becoming warmer and warmer these years.
【单选题】Earth's climate would surely become warmer and warmer.