20. George Washington ___ his father's cherry-tree.
(A) failed
(B) fell
(C) felled
(D) fallen

易混淆動詞fall/feel/fell/fail
Fall
用法：1.fall-fell-fallen(vi.)落下：跌倒
2.fall asleep(睡著)/fall behind(落後)
例句：An apple fell to the ground.(一個蘋果落在地上。)
Be careful on the ice or you will fall.(在冰上要小心，否則你會跌倒。)

Feel 
用法：1.feel-felt-felt(vt.)覺得；摸摸看
(vi.)有感覺
2.feel like…(想要；摸起來像…)
3.feel sleepy(想睡)/feel one’s pulse(把脈)
例句：My fingers did not feel.(我的手指頭沒有感覺)
I felt my heart beating violently.(我感覺我的心在猛跳)
Do you feel like taking a walk?(你要不要去散步)
It feels like silk.(他摸起來像絲)

Fell
用法：fell-felled-felled(vt.)砍伐(樹木)
例句：He fell down while he was felling a tree.(他砍樹時跌倒了)

Fail
用法：fail-failed-failed(vi.)失敗；(學科，考試)不及格；不能…
例句：The student failed in the examination.(這個學生考試不及格)
I fail to see what you said.(我不明白你的意思)

fell (vt)及物動詞 , 砍倒

fell ---vt.及物動詞 , 砍伐，砍倒