国际工程承包合同争议解决的仲裁地点，比较常见的选择是在（）仲裁。
A．被诉方所在国
B．合同中约定的第三国
C．工程所在国
D．投诉方所在国
参考答案：C
已知F1、F2是椭圆C的左、右焦点，点P在椭圆上，且满足PF1＝2PF2，∠PF1F2＝30°，则椭圆的离心率为________．
用所给词的适当形式填空。
1. Would you like some fish _______(eat).
2. The box is too heavy for Ann_______ (take)
3. The teacher made him _______ (clean) the window
4. My father often teaches me _______ (make) toys.
5. The little boy often _______ (walk) home after school.
