—____________ difficulty you meet, remember that it might just be a touchstone. —You are right. __________ difficult it is, we will never give in.

 —Why! I have nothing to write about. _______ that you want me to say?  —Your summary for this term and holiday schedule.

Make a tentative guess _____ Peking Man _____ have done and used thousands of years ago.

 Look, a group of students are playing the violin there, _______ their teacher as the conductor.

This is the best film ___ have ___seen.