Alone in a deserted house, he was so busy with his research work that he felt ___but lonely.

Clothing made of man-made fibers has certain advantages over _____ made of natural fibers like cotton, wool or silk.

I like a house with a beautiful garden in front, but I don’t have enough money to buy ____.

Our bedrooms are all on the sixth floor,        with its own bathroom.

I didn’t know which shirt was better, the black one or the red one, so I took  them     .