18. My mother ____ for Beijing in a few days. I wonder when the earliest plane ____ on Monday?
The officials said the downward trend of A/H1N1 flu activity did not______ mean the worst was over. Flu activity might pick up next year.
Many people believe we are heading for environmental disaster _____ we basically change the way we live.
—Who _____ it be that is knocking at the door? —It ______be father, but I’m not sure.
You can't imagine _____when they received these nice Christmas presents.
The meeting was of _____, and the information he offered at the meeting was_____.