There must be ____ with the machine.

Peter is really ____; I don’t think I will get ____ working with him in the same office.

—What do you think of your trip to Yunnan? —I really enjoy it. I didn’t expect it was    wonderful.

A government official was murdered last Friday and the police are collecting information that is ____ to the case.

Traveling is ______, but we often feel ________ when we are back from travels.