Finish each of the following sentences in such a way that it means exactly the same as the sentence printed before it

53. The boys are very delighted to see their school surrounded by paddy
fields.
→ The boys are delighted that_
54. In the past, classrooms were usually made of mud and straw.
→ In the past, classrooms used_
55. The electricity system of the school has been upgraded, which makes the
students very happy.
→ The students are