At the foot of the hill you could hear nothing but the ________ of the running water.
—Do you know the activity called “________ Lights” ?—Oh,it’s an activity that reminds people of saving energy.
—Could you tell me ________?—Sorry, I don’t know, but I’ll call you as soon as she tells me.
The second season of A Bite of China ________ for a month. It turns out to be the most popular documentary.
—Remember this, children. ________ you study, ________ knowledge you will get.—We know, Mr. Green.
Show your ID card, ________ you won’t buy the ticket.