【2015江苏南京】B) 根据句子意思，用括号中所给单词的适当形式填空。
46. — I really like your bike. Is it expensive?
— I don't know how much it is. It's my ________(uncle)．
47. We think Samuel is the most suitable person to be our monitor because he does everything very ________(careful)．
48. Citizens can enjoy ________(read) thousands of volumes of electronic books online with the first “WeChat library” in Jianye Library, Nanjing.
49. We need to make more young people ________(learn) Shadow Play so that it won't disappear in China.
50. With the ________(develop) of technol ogy, the journey to Mars might only take about 20 minutes in spacecraft in the future.
