Good shoes, clothes and a backpack are the basic ________ you need for your hiking.
A.equipment B.instruments
C.tools D.models
The Australian boy has a good ________ of Chinese and can express himself freely in it.
A.power B.command
C.demand D.usage
—How can I use the equipment?
—Well, just refer to the ________.
A.directions B.explanations
C.expressions D.introductions
—Do you know why Jane was so angry?
—Her roommate gave in to ________ and opened the letter addressed to her.
A.curiosity B.consideration
C.concern D.convenience
In my brother's absence, I would like to thank all concerned on his ________.
A.behalf B.part C.business D.interest
—What does PM 2.5 mean?
—It's a professional ________ indicating the condition of air pollution.
A.term B.item C.number D.mark