—Who called me this morning when I was out?—A man calling ______ Robert. 

 – Can you come on Monday or Tuesday? -- I’m afraid         day is possible.

---Is there anything else I can do for you, Jack? --- No, thanks. I really appreciate ______ when you lent all your notes to me before the exam.

________ matters much ________ our headmaster supports our plan.

There is _____with  your  computer.