My father’s new cellphone can be used ______e-mails.— Is he used _____ on such a small screen

I have heard you’re going to change your job. Are you serious– ______. I will quit my job.

Lilyis popular among her classmates shecan be annoying at times

Last term our maths teacher set so difficult an examination problem _____ none of us worked out.

______ you eat the correct foods ______ be able to keep fit and stay healthy.