Đáp án + giải thik giúp mik vs ạ

1. Agriculture may c_ _ se environmental problems

2. One of/ the inportant/ leaning language/ is writing./ skills in/

3. was given first-aid/ before/ to hospital./ The victim/ he was taken/

4.were talking/ noisily/ when the teacher/ The students/ came in./

5 . Phong doesn't like English . He is very bad _ _ it