我的电话号码以两个零开头。

My phone number starts with two ___zeroes.

经过这次失败，他的希望彻底破灭了。

After this failure, his hopes fell to ___zero.

使用前，记得将血压计归零以确保读数准确。

Remember to ___zero the blood pressure monitor before use for accurate readings.

教练让我们把注意力集中在基本动作上。

The coach told us to ___zero in on the basic moves.