The scientist knew nothing about the matter, because he was always _________ himself in his study.
After a long discussion about the advantages and disadvantages of the plan, they finally came to a(n) ________that it was practical.
________to attract young readers, the book is full of interesting stories and features simple language.
________is a pity that you forgot both her address and her telephone number.
What time is it now? My watch is________.
Twofifths of the highway________so far.