I really don’t know ________ I put my wallet after I paid the bill.

Read this story，________you will realize that not everything can be bought with money.                                                                  (2013·四川，4)

Only by increasing the number of doctors by 50 percent ________ properly in this hospital.                                                           (2013·大纲全国，32)

“Never for a second，”the boy says，“________that my father would come to my rescue.”                                                        (2013·江苏，27)

How I wish I _____ the army then. I would have become a soldier.

If he _________ more time practicing speaking English before, he ____ able to speak it much better now.

So necessary _____ it to learn about their customs that I will attend a special lecture next  week.

It’s crazy of you to spend more time playing computer games than you _______ studying.