19, Jean cloth was made completely from cotton in the \(18^{th}\) century
20, You can write an English letter, can't you?
21, The last time everybody saw Tom was a week ago.
22, The English test will be taken by all the students of the ninth form next week.
23, Our teeth should be brushed carefully after meals.
24, The traffic rules must be observed strictly
25, Their homework was done well.
26, I wish I didn't have to do homework every night.