(2013·四川省都江堰市二模)—Mike, I can't find my watch anywhere.
—You ________ it while working out.

(2013·江西鹰潭一中高三一模)What a pity! Considering his ability and experience, he ________ better.

(2012·全国卷Ⅱ)I'm going to Europe on vacation together with John if I ________ find the money.

(2013·湖南高考)He ________ sleep, although he tried to, when he got on such a hunt for an idea until he had caught it.

(2013·江西高考)When I was a child, I ________ watch TV whenever I wanted to.

According to the rules and regulations, all payments ________ be made in cash in the shopping center.

________ we go to the McDonald's? I'm sick of the food there.

With all his money, he ________ worry about a little thing like 5 cents!

—It's no easy task to catch a ticket on a website that receives 1 billion clicks daily.
—I can't agree with you more. There ________ be errors for every single step.

The public transportation is very convenient in that big city, so there ________ be any difficulty in traveling around.