我讨厌锻炼，但我只是咬紧牙关，努力坚持下来。

I hate exercising, but I just ___grit ___my ___teeth and try to get through it.

尽管疼痛，她咬紧牙关完成了马拉松。

Despite the pain, she ___gritted ___her ___teeth and finished the marathon.

为了在商业中成功，你经常必须咬紧牙关面对挑战。

To succeed in business, you often have to ___grit ___your ___teeth and face the challenges.