Do you think ______ important _______ us to learn a foreign language

Please clean the room at once, it’s too ______.

his work these days，hehash’t _____ when to pay a visit to his parents· A．BentOn：decided on B．Worriedabout；turned onC．Facedwith；taken on D．Devotingto；focused on

I know it’s normal for such a thing to happen, but we _____ it if we’d been more careful.

In the experiment we kept _____ watchful eye on ______developments and recorded every detail.