(2013·济南一中模拟)—Where ________ Mary have put the empty bottles?—She ________ them away. They must be somewhere.

(2013·河北衡水中学模拟)Some young people these days just ________ go out of their homes to contact the real world.

(2013·重庆一中模拟)—Who ________ be phoning us at this time of night?—It might be your sister.

(2013·西安市高三二模)—John looks a bit upset. Did you tell him the bad news?—Yes, but I ________ him after his birthday party.

(2011·江苏高考)—I left my handbag on the train, but luckily someone gave it to a railway official.—How unbelievable to get it back! I mean, someone ________it.

(2012·江苏高考)—Happy birthday!—Thank you! It's the best present I________ for.

(2012·江苏高考)Days later, my brother called to say he was all right, but ________ say where he was.

(2013·新课标全国卷Ⅰ)The door ________ open, no matter how hard she pushed.

(2013·大连二模)We each ________ strong points, but each of us on the other hand ________ weak points.

(2013·成都第二次诊断)—Where did you get this book?—I picked it up from a second­hand bookshop if you ________  know.

(2013·四川省六校二模)Jack is an outgoing child, usually kind and helpful, but he ________ lose temper sometimes.

(2013·江西十所重点中学第一次联考)What's your opinion of Mr Li's request that we ________ spend half an hour reading English aloud every morning?

(2013·辽宁五校一模)The little child  ________ go out alone at night, so he ________   walk in the dark that night.

—Is it good to look up every new word when I come across it in reading?—No, you ________， because you are likely to guess the meaning from the context.

(2013·吉林长春一模)—Please don't tell anybody.—I ________. I promise.

(2013·山西省太原市统一检测)—David, the windows of the room are very dirty. ________ I clean them before we move in?—Of course.

I have learned that it's taking ________ long time to become ________ person I want to be.

Because of H7N9 bird flu, all the chicken markets in Shanghai have been closed and won't open until further ________.

One reason for her ________ for city life is that she can have    easy access to places like shops and restaurants.

—What does PM 2.5 mean?—It's a professional ________ indicating the condition of air  pollution.