The traffic on the main streets has a longer green signal than________on the small ones. (2013·四川,2)
The book __________ ten units, two revisions
—Why didn't he attend the meeting yesterday? —__________ he caught a bad cold and now he is in hospital.
Many years ago, he dreamed of becoming the first person __________ both South and North Poles.
The __________ of his aim depends largely on himself.
I was about to go out __________ he came in.