Hang your wet towel over the chair to ________ it ________.

The stamps were __________ according to their styles and features.

As soon as the children were _____, their mother got them out of bed and into the bathroom.

Although the situation was tough during the economic crisis now things are beginning to ________.

At night, plants _________carbon dioxide and at the same time _________oxygen. So, we may put some in our bedrooms to purify the air.