The Smiths consider ______ a computer, which is commonly considered ______ a great help in our work and study.

－Who will be the winner of the speech contest－No one can know the result until it ____________tomorrow morning.

How do you deal with the disagreement between the company and the customers— The key _____ the problem is to meet the demand _____ by the customers.

The police were seeking more information to find out _____ the rich merchant.

have you been —I got caught in traffic, otherwise I_______ here earlier.