【推荐1】It was not until man had learned how to make iron and steel that the construction of various machines _______ (make) possible. (所给词的适当形式填空)

【推荐2】Dead trees came crashing down without warning—one nearly got us, which made us________（jump）. （所给词的适当形式填空）

【推荐3】—How do you deal with the disagreement between the company and the customers?
—The key to ________ (solve) the problem is to meet the demand ________ (make) by the customers. (所给词的适当形式填空）

【推荐1】The woman stood by the river still as if she ________ (turn) into a stone. (所给词的适当形式填空)

【推荐2】Everything in my childhood crowded into my mind as if they ________ (happen) yesterday. (所给词的适当形式填空)

【推荐3】It was John who broke the window. Why are you talking to me as if I_______（do）it?(所给词的适当形式填空)

【推荐1】Look at her face. She seems ___she has done a great thing. (用适当的词填空)

【推荐2】He opened his mouth several times as if ________ (tell) us something. (所给词的适当形式填空)

【推荐3】It seems ________ the brain is preserving its most important memories.(用适当的词填空)