你是劉玲(Liu Ling)，寫一封給曉東(Xiao Dong)的道歉信，講明道歉的原因、解決問題的辦法，以彌補(bǔ)因曉東來拜訪而自己不在家給他帶來的沮喪。

_____you eat the correct foods_____be able to keep fit and stay healthy．

• A、Only if；you will 
  

• B、Only if；will you 
  

• C、Unless；you will
  

• D、Unless；will you

The underlined word“it’’in the third paragraph refers to .

• A、the leaf
  

• B、the stalk  
  

• C、the stem 
  

• D、the Plant