---Have you seen____pen? I left it here this morning.---Is it ____black one? I think I saw it somewhere.
One hundred percent _______ to your studies, though it can be lonely and no fun at all, will leave precious marks on your youth.
While intelligent people can often _____ the complex, a fool is more likely to complicate the simple.
—Could you help me take care of my pet dog on the weekend? — I’m afraid I’m not that day.
—I began to learn English when I was a little child. —Wow. You must have studied English for many years, ?
—Have you got any particular plans for the coming holiday?—Yes._____, I’m going to visit some homes for the old in the city.