"Face" should not be "harsh", but should be changed to:
Dad's smile disappeared and became stern.
2. Zhang Hong made up his mind about the difficulties in studying his lessons.
"Overcoming" and "Difficulties" do not match, so it is changed to:
Zhang Hong is determined to overcome the difficulties in his study.
Xiaoming has made great progress, and he is not complacent at all.
Although-does not match it, change it to:
Xiaoming has made great progress, but he is not complacent at all.
My mother is not only full of silver hair, but also agile and looks tough.
Not only-but also illogical, change it to:
Although my mother has silver hair, she moves neatly and looks tough.
3. Colorful red flags fluttered in the wind.
If it is a red flag, how can it be "colorful"? Change to:
Colorful flags fluttered in the wind.
He has always maintained this hard and simple style.
Frequent and consistent semantic repetition, changed to:
He has always maintained this hard and simple style.
1. area = bottom× height = 12/ 13*26/27=8/9 (square meter)
2. In the afternoon, 7/8 * 2/3 = 7/ 12m was paved.
A * * * pavement 7/8+7/ 12=35/24 (m)