—Why do many people keep dogs as pets?—Because they are our ____ friends and they never desert their masters.

He is believed to be one of the best _____ composers. Although old, he is very much ____ and he can give a ______ description of what happened.

We need a (n) ____________ team leader who can really motivate the members to work harder.

Our boss is very ________，so we have to arrive on time，or we would be fined.

The microphone enabled them to keep in touch, in other words, it made it _____ for them to contact each other.