We should try our best to learn English well.(spare no effort, make all efforts, etc.)
I have been to the Great Wall.
We should __do__ _our___ _best___(尽力）to learn English well.
I __have__ __been__ __to__ (曾经去过）the Great Wall.
1.try our best 2. have been
do our best
have been to
do our best
have been to
__do/try__ __our__ __best__(尽力）
have__ _been___ _ to_ (曾经去过）
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