I 'll try my best (to do sth)!
I'll make great efforts (to do sth).
I'll try hard(to do sth).
I'll exert myself(to do sth).
I'll exert myself to do sth.
I'll do my endeavor (to do sth).
I'll do my possible(to do sth).
I'll do my utmost endeavour(to do sth).
I'll strain every nerve (to do sth).
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