. However hard I tried to explain it to her, she just couldn’t understand. I found her impossible to .
Mark Twain _____ along the Mississippi River, which was _____ to his writing.
___ in London, the penniless American wandered on the pavement, ___ to find a job to make a living.
---Are you coming to Betty’s wedding? ---I’m not sure. I ______ go to Beijing on business that day. A. must B would C. should D. might
The children all look forward to _______ the carnival next week.
You can trust him because he always ________.