In each of the following questions, choose the option that best completes the gap(s).

The boy _____ the flute for about thirty minutes.

In each of the following questions, choose the option that best completes the gap(s).

Each of the answers ______ correct.

In each of the following questions, choose the option that best completes the gap(s).

Each of the reports ______ been carefully reviewed by the committee

In each of the following questions, choose the option that best completes the gap(s).

The ____ of armed robbery has been on the increase.

In each of the following questions, choose the option that best completes the gap(s).

The doctor ____ him to take his medicine regularly.