Tom raised his hands ______ to say something, but he remained silent in the end.

I have worked with children, so I know _____ to expect in my job.

Tom looked upon the test as an obstacle _____ his classmates regarded it as a challenge.

________ many countries in Latin America have been trying to reduce gaps in income, America has allowed inequality to grow.

Playing QQ’s “Happy Farm” by planting, watering, fertilizing, spraying, harvesting and selling of virtual vegetables, fruits and flowers, we can find out       all the excitement is about.