(2013·青岛一模)Scientists are still wondering ________ the Egyptians built the pyramids so long ago.

(2013·衡水一模) The question ________ you should take this medicine should be decided by your family doctor. (2013·河北石家庄一模)下列各句中，没有语病的一项是(　　)(3分) (2013·齐鲁名校一模)To make the most of your time, live every moment as if it________ your last. (2013·江西南昌一模)It hasn’t been made clear ________ the new underground line is to be open to traffic (2013·山东济宁一模)How close parents are to their children ________ a strong influence on the development of the children’s characters. 青岛之花是青岛独一无二的（）。 (2013·滨州市一模) ________ contents, Mo Yan frequently writes about his own hometown, Gaomi, Shandong Province (2013·东北三校一模)________ his career as an actor he never gave up his hope of becoming a Hollywood star (2013·开封高三第一次模考)It is announced that big prizes will go to ________ finishes the assignment on time (2013·江西南昌一模)Why ________ it get colder when we climb up a mountain? We are getting nearer to the sun! 2013年7月，青岛海域遭受了浒苔的侵袭，它的形成主要是由于（　　）。 (2013·江西鹰潭一中高三一模)What a pity! Considering his ability and experience, he ________ better. (2013·银川高三二模)It remains to be seen ________ this plan is practical enough to keep the project going (2013·咸阳二模)The murderer, together with his two brothers, ________ sentenced to death just now (2013·安徽重点中学一模)Not only ________ to turn off the lights in the kitchen, but we also failed to lock the front door. (2013·东北四市一模)After visiting Harbin, most of the foreign friends said they would never forget the time ________ they had spent. (2013·安徽省芜湖三校一模)A recent study has found that the number of smokers ________ sharply over the past five years (2013·四川南充市一模)My favorite writer is Mo Yan, some of ________ novels have a surprising ending. (2013·江西九校一模)A lot of lovers chose to get married on Dec. 12, 2012, ________ the date, the month and the year match. (2013·四川省乐山一模)The pupils were playing games in the classroom ________ a gunman entered and began shooting wildly at them