根据下列句子及所给汉语注释，在句子空缺处写出各单词的正确形式（每空只写一词）。
 There are about two ____ （百）students playing on the playground.
  The mother is ____ （自豪的）of her son, because he is very successful in his work.
 There are many kinds of English ____（字典）in this bookstore. You can choose the one you like.
  Look at the photo____ （仔细地），and you will find our teacher.
 Would you mind____（打开）the window? We need some fresh air.

已知两点$A(1,0),B(1,\sqrt{3}),O$为坐标原点，点C在第二象限，且$\angle AOC={120}^{°}$，设$\overrightarrow{OC}=-2\overrightarrow{OA}+\lambda \overrightarrow{OB}(\lambda \in R)$,则$\lambda$等于 （ ）

如图，若将△ABC绕点C顺时针旋转90°后得到△A'B'C'，则A点的对应点A'的坐标是                                                    （   ）