What he said was_____ difficult for us_____ understand.[ ]

He did not for a minute to save the drowning child and jumped into the river immediately.

I will go to the park_____they played basketball last week.

The poor _______ man lived ______in a small house, and he often feels ______.

The speech by the mayor of Shanghai before the final voting for EXPO 2010 is strongly impressed ___ my memory.