So difficult __________ it to work out the problem that I decided to ask Tom for advice.
Little _______ about her own safety, though she was in great danger herself.
More than 100 students have entered for the competition and_______ gains the most points will be the winner.
_____ any change about the date,please tell me immediately.
There are over 58000 rocky objects in ______space,about 900 of which could fall down onto ______ earth.
--So you missed the important meeting yesterday? --_________. I got there five minutes before it was finished.