Is that Tom in the teachers’ office–No, it ________ be him. He’s gone to the hospital.

income worry is _______ rather common problem of the aged, loneliness is another problem that _______ aged parents may face.

I ______ through that bitter period without your generous help. [ ]

The book I bought from thebookstore isn’t here. Who __________

In order to ______ a good knowledge ofEnglish, he gave up his job and went to study in an English training center.