1 . 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)

2 . 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)

3 . 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)

4 . Actually, Einstein’s theory of relativity and his other scientific works are not _______ hard to understand with a little study.

A．such	B．that
C．only	D．thus