Bài 1: change these sentences into passive voice a, people make the artificial flowers of silk b, the people grow corns in many countries Bài 2: Fill in the blanks with the appropriate prepositions a, this picture is different... that picture b, I take part... outdoor activities of my school

Prepositions in sentence b: I take part in outdoor activities of my school. Preposition: in

Prepositions in sentence a: this picture is different from that picture. Preposition: from

Passive voice for sentence a: People make the artificial flowers of silk. Active: People make the artificial flowers of silk.

a. this picture is different from that picture. b. I take part in outdoor activities of my school.

a. The artificial flowers of silk are made by people. b. Corns are grown in many countries by the people.