We must work hard to ___ a good knowledge of English.
—Hi, Mr.Brown! May I pick a flower in the park? —____.
Difficult as the question was, David ____ to find an answer.
Dickens visited America in 1842, publishing American Notes on his return and ____ his experience in another book.
.____ the news, so far, has been good, there may be bad days ahead.
—We’d better go downstairs right now for lunch. —____ They serve food 24 hours a day.