One of the responsibilities of the Coast Guard is to make sure that all ships______followtraffic rules in busy harbors.

Homing pigeon is useful as a ______ carrier because when taken from home, it will return atthe first opportunity.

The suspect cooperated fully with the police when ______ about his role in the incident.

If you’re sitting around a lonely campfire at night, the howl of a wolf can sound pretty______.

Those familiar with evening dress will always ______ black with elegance.

The proposal deserves support as it gives ______ to the needs of children.

______ the popularity of robots in Japan, the country ’s robot-production growth is slowing down.

We have to wait for the bus, ______?

Mrs. Smith locked both the front and the back doors before she went to bed______thatsomeone might steal into the house at night.

The hosts apologized for ______ that some of their guests might be vegetarians.