Tom,would you please ________ the box It’s for your sister.

It is the idea____smiles can get rid of cold ____has been proved by the researchers many times.

Colorful flowers come out now. It’s wonderful for us to __________ nice flowers everywhere in spring.

填入下面一段文字横线处的语句,最恰当的一句是（ ）在全球变暖的大背景下,纳木错水位逆势上涨,吸引了众多科学家的目光。研究认为,近年来纳木错地区低云量的显著增加是造成纳木错水位上升的原因之一。 ,伴随气温的升高,蒸发量不一定随之增加,它还与云量、日照、辐射等因素密切相关。

(2014·山西省六所重点中学模拟)—Believe it or not，my sister and I are twins.—Oh，you must have had the case________you were taken for your sister.