I Use the right form of the future simple tense 
1.I (return) ..will return.....in May 
2 My father(take)....will take....me to the party.
3 They(not pay) will not pay thier bill tomorrow.
4. will You (arrive) arrive soon ? 
II Rewrite the sentences ,using '' adj + to-infinitive/noun clause''
1. I passed the exams .I am happy.
-> I am happy to pass the exams.
2.We are going to clean the environment.We are ready.
-> We are ready to clean the environment.
3.Keeping people from littering is very difficult.
-> It is very difficult to keep people from littering.
4 You want to know more about 3R.I am very pleased
-> I am very pleased that you want to know more about 3R.
5 We are worried .The rivers are becoming heavily polluted.
-> We are worried that the rivers are becoming heavily polluted.
6.My teacher feels happpy.My class won the first prize in collecting waste paper 
-> My teacher feels happy that my class won the first prize in collecting waste paper.