The World Health Organization gave a warning to the public without any ____when the virus of H1N1 hit Mexico in April, 2009.
---How do you like the lecture by Mr. Lee? ---____________.
The drill in Antarctica dragged on slowly because of lack of money, equipment breakdowns, environmental_________ and severe cold.
. ---Where did the couple find their child? ---It was in the park_________ the family used to camp.
He stayed up too late every night, _____ to catch up with his classmates.
I like getting up very early in summer. The morning air is so good______.