For many online shops, the price of their products can be decreased _______ 30% in the holiday seasons.

The news came as quite a shock to us _____ a ship with 82 passengers on board sank near the north coast.

Is this _________ ruler—No. ________ is over there.

It was really dangerous for ________to look at the phone while she was driving .

______ do you study for a test— I study by working with my classmates.