1.Advertising media like direct mail, radio, television and newspapers ___ to increase the sales of industrial products.

D.has been used

D.being

3.——“The president made a brilliant decision, didn't he?”——“Yes, he did. I don't know what I would have done if I ___ to make that decision.”

4.Humble ___ it may be, there's no place like home, ___ he may go.

5.He still remembered one morning five years ago ___ she came to his house and encouraged himto overcome difficulties.

D.when

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