When the fire started, Tom was to help all the children out. He is both brave and smart.

Tan Dun is _______ an excellent composer _______ he can make music without boundaries.

Excuse me.How long can I keep the book-You can return it by the end ofthis month.

Ten thousand dollars _____quite a large sum.

Who should be responsible for the heavy burden of the students— ______ the test system instead of the teachers.