It’s unwise of you not to       his suggestions, for he is an authority in this field.

It is reported that in our country cities ________ heavy air pollution that is 30 percent above the national standard or higher should try to meet standards by 2030.

I dropped my keys in the grass, but luckily Kate _______ them.

I can’t say which type of tea tastes better. It’s just a(n) ______ of personal preference.

An experienced doctor usually judges a patient’s illness according to the various________.