1.did they give food to homeless people last year
-->was food given to homeless people last year?
2.Although the weather was bad ,the football match was not cancele.
--> despite the bad weather, the football match wasn't canceled.
3.many river and lakes are poisoned . Factories produce waste and pour it into rivers and lake
--> because many rivers and lakes are poisoned, because factories produce waste and pour it into rivers and lakes.
4.the girl worked hard , her stepmother wasn't happy
--> although the girl worked hard, her stepmother wasn't happy.
5 ''we don't open the laboratory today.'' peter said to his colleague
--> peter asked Peter asked his colleague not to open the laboratory that day.
6.''will the earth ever be visited by aliens '' Phong said to Dr .Nelson
-->Phong asked Dr. Nelson if the Earth would ever be visited by aliens.
7 ''have you ever looked through a telescope ?'' I asked John
--> I asked John if he had ever looked through a telescope.