选出与句子中划线部分意思相同或相近的，并能替代的最佳选项。

1. My best friend Laura is good at schoolwork.      [ ]

A. does housework well 

B. likes helping her parents

C. gets good grades

D. has cool clothes

2. The old man is over seventy, but he is still in good health.[     ]

A. more than          

B. about          

C. around  

D. at

 3. Maria took part in yesterday's singing competition and won the first prize.[     ]

A. join                

B. join in              

C. got          

D. had

4. Mozart started writing music when he was four years old.[     ]

A. for four years old  

B. in four years old    

C. of four years old  

D. at the age of four

5. Midori is a well-known violinist who was born in 1971.[     ]  

A. popular      

B. talented      

C. famous    

D. unusual