1 . N________, people are more likely to live longer, and they are also better educated than in the 20th century. （根据首字母单词拼写）

2 . We all look f____ to the day when the scientists can discover more secrets of the universe. (根据首字母单词拼写)

3 . The children have read the poem several times, and can all recite it quite f____ now. (根据首字母单词拼写)

4 . When the clock didn’t work, he took it a______, found what was wrong, and put the whole thing together again.(根据首字母单词拼写)