29．The police tried to get some clues from the suspect, but he remained________

Despite their _______ plans, Chinese carmakers will find it hard to break into the developed world until this shortcoming is well behind them.

Ms Alice is considered a ________ lady by us, for she often helps the poor she met with.

The letter was______as it was the only one ever signed by the the Queen.

The recent study has shown that people's attitudes towards protecting the environment are not     with their behavior in daily life.