The BRICS countries have____ to be a source of global economic development and essential to generations.
— Why didn’t you give a hand to the boy? — I _______, but he struggled to his feet before I tried to.
—You didn’t invite Mary to the ball?—____ her, too?
I only know we will have a League meeting, but I have no idea when _________ it.
______ is known to all, the earth travels round the sun once every year.
Many people in China are ________ a “Hope Project”, helping poor children to get compulsory education.