Find a mistake in each sentence and then correct it 1.Valentina Tereshkova was the first woman exploration who flew into space in 1963. A . was B . first C . exploration D . flew 2.Do you want to be tell what to do ? A . Do B . to be C . tell D . to do 4.The river is too dirty for us to swim in it A . river B . too C . for us D . in it 5 . We had lived there since ten years before moving to their present house. A . had lived B . since C . before moving D . our persent house 6 . Lots of aquatic have dead because of oil spills A . Lots B . aquatic C . have dead D . of Quan trọng là giải thích tại sao nha