根据句意,写出括号内所给单词的适当形式。
Mr. Wu had no (choose) but to work extra hours in order to finish it on time.
To break the (silent), the teacher told a joke and the students all laughed right away.
My father is much_______ (strict) with us than usual because of the important exam.
We hope that we live in a (peace) world and say goodbye to wars forever.