— Shall we take a taxi? — No, we         . It’s not far from here.

(2013·高考新课标全国卷Ⅱ)Since nobody gave him any help，he________have done the research on his own.

--- _________ David be the new chairperson of the Students’ Union? --- He ________ be, but I’m not sure.

— Who is absent from the lecture today? —_____________you ask? Peter, of course.

― Why ______ you stay in the countryside, where it’s not convenient to go shopping?―But I’ve found it rather valuable for my health.