根据汉语意思完成句子。

1. May I go ____________ (买东西)?

2. You ____________ ____________ (努力学习) in school.

3．Let's go on ____________ (去旅行).

4. Beijing is ____________ ____________ (离得远) our city.

5. You can go to a ____________ (旅馆).

用七条直线最多可画出几个不重叠的三角形( )

A．10个

B．11个

C．12个

D．13个