If steel is heavier than water, why are ships able toon the sea?
I wonder how long it will take you_____ such a hard task within so little time.
Tom was absent from school this morning, because sometimes he was a little weak and could ______ill .
. Will you pass me the dictionary _____ the cover is dark blue?
_____the girl could rush out of the house, the roof fell upon her.
The company wouldn’t decide to_________ dozens of its employees in spite of the sharp drop in sales.