`1.`We are often taken to the zoo by our father at weekends
`2.`All flights were cancelled because of fog.
`3.`A lot of flowers were planted in Da Lat.
`4.`Football is played in the afternoon.
`5.`English is spoken all over the world.
`6.`The classroom wasn't cleaned yesterday.
`7`.The streets are swept by the workers everyday.
`8.`Lan's mother was taken to the airport by her.
`9.`I was helped do the homework by my sister yesterday.
`10.`Millions of old cars tires are thrown away.
