20.1
3 Glass is made from sand.
4 Stamps are sold in a post office.
5 Football is played in most countries.
6 This machine isn't used very often.
7 What language is spoken in Ethiopia?
8 What is this machine used for?
20.2
3 This room was painted last year.
4 These house were built about 50 years ago.
5 Ann's bicycle was stolen last week.
6 Three people were injured in the accident.
7 When was this church built?
8 When was television invented?
9 How is the window broken?
10 Was anybody injured in the accident?
11 Why was the letter sent to the wrong address?