I know one of the things _____I was unsure about was _____ hard it would be to climb this mountain.

下列对课文内容的理解，错误的一项是

More than 2,000,000 Chileans are expected__________homeless as a result of the massiveearthquake measuring 8.8 magnitude

_______he was laid off last year ______ how serious the economic crisis was

I fix the bikes and ________