His letter was so confusing that I could hardly make any        of it.

There is an obvious _______ between children spending too much time playing computer games and their bad grades at school. 

Shelly had prepared carefully for her English examination so that she could be sure of passing it on her first ________. 

The Chinese are looking forward to the first_________to land on the moon after Yang Liwei’s successful trip to space.           

Sorry, sir. It wasn’t my_____ to disturb you last night.