It took several hundred years ______ paper-making spread to western countries.
Climbing the mountain was so ___ that I was completely ___ out.
---Do you think the Labor Bill will be passed? ---Oh, yes.It’s ___ that it will.
I have ___ to expect in my job except to get a rise in pay.
Their cheerful voice showed that they were doing ___ .
My students are all quiet.Even after class, my students spend ___as they can playing outside.