— Mom, this is my new friend, Jack.

—         .

汽车遇红灯在路口等待时，通常是不熄火的，这不但会白白消耗能源，同时还会造成环境污染。有研究显示，汽车不熄火等侯10秒钟，约需消耗汽油11毫升。若在路口等候30秒，消耗的汽油质量约为多少克?(ρ汽袖＝0.8X10³kg／m³)   

    Hello, my name is Gina. John, Anna and I are good friends. We are in the same grade (年级). But they are in Class Five and I am in Class Three. We get up at 7:00 and go to school at 7:30. In the morning we have four lessons. We have English every morning. John and Anna have English at 10:00 in the morning and I have it at 11:00. English is my favorite subject. Math is their favorite. And we all like P.E.

    In the afternoon, we have three lessons. At 2:30 we have the art lesson in the same classroom. After school we often play soccer. We all like soccer. Sometimes (有时) we watch TV at my house. We don't play any computer games.

根据短文内容，选择正确答案。

对别人承诺过的事情应该兑现，有时偶尔不守信或失约，我们应该认为（   ）