____ in a dark room, the little girl was so frightened as to cry loudly.
—Have you finished your book report?—Not yet. I couldn't________on it with so loud music next door last night.
Once we have________some knowledge, things do not become more difficult, but comprehensible.
The chief editor demanded that the article ________immediately.
Tom is a promising student. I am sure that with his________effort, he will make a very successful scientist.
We are hoping that these measures taken by the local government will help________things a bit.