1.Abacuses are so fast and accurate that people still use them today.(用enough to 改写）
2.My dictionary cost me 50 yuan.(同意句)
3.It took him two hours to finish his homework yesterday.(同上）
4.She could write letters in English at the age of eight.
She_____ ______ _______ write letters in English at the age of eight.
Abacuses are fast and accurate enough for people to stll use them today.
I spent 50 yuan on my dictionary.
He spent 2 hours finishing his homework yesterday.
She was able to write letters in English at the age of eight.
1:Abacuses are fast and accurate enough to let people use them today.
2:I spent 60 yuan buying a dictionary.
3:He spent two hours in finishing his homework yesterday.
4:was able to