在开始锻炼前，你应该检查一下你的心率。

You should ___check your heart rate before starting to exercise.

在长途旅行前，总是检查你的机油、水和轮胎。

Always ___check your oil, water and tyres before taking your car on a long trip.

我完成考试后，检查了我的答案以找出错误。

After I'd finished the exam, I ___checked my answers for mistakes.