I.Find the mistakes in the following sentences, underline and write the correct one.
1.My sister has taken part in swimming competition at school last week and wins the third prize.
2.The longer book I read is the Prison Diary of Ho Chi Minh.
3.Singapore is cleanest city in the world.
4.It doesn't rain since last week.
5.I have never seen a such big flower
6.It spent a long time to travel to the skiing resort but in the end we got there.
7.Have she finished her homework yet?
8.People in Viet Nam are very friendly but good-hearted
9.We must be well-prepared before climb Mount Fansipan.
10.Which country is Brazil in?
Help.