5.He spent 4 hours in doing his homework yesterday.
It took him 4 hours his homework yesterday.
6.It seems that they like pop music.
They to like pop music.
7.They have studied English for 20 years.
They began to study English .
8.He went to the class at 9 o‘clock.
He didn‘t go to the class 9 o’clock.
「正确答案」7.20 years ago8.until
9.He spent 20 dollars buying this book.
He20 dollars this book.
10.She does well in English.
She is English.