There are over 58, 000 rocky objects in ________ space, about 900 of which could fall down onto________ earth.
Our water supply has been ______ because they are repairing one of the main pipes.
There are _________ flowers shown in the park and _______ people go to have a look.
_____ he referred to in his article was unknown to the general readers.
--What do you think made Celia so happy? --______ a prize in the recent competition.
Mr. Hilton’s new house is almost _____ the one he used to live in.