Picasso's（）ability was apparent in his early youth when he started drawing sketches.

We hope that the measures to control prices,（）taken by ...

单项选择题We hope that the measures to control prices,（）taken by the government, will succeed.

The troops have been on the（）for a possible enemy at ta...

单项选择题The troops have been on the（）for a possible enemy at tack.

Some philosophers insist that one way to（）knowledge is ...

单项选择题Some philosophers insist that one way to（）knowledge is through an empirical approach.