The contract won't come into effect until it ( sign )__________by the legal representatives of both parties. (2018年12月第35题)
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Training new staff should ( conduct )___________ as soon as possible after they are hired.(2018年6月第31题)
When they entered the area , the visitors ( require )_______________ to turn off their smartphones.(2017年12月第34题)
Our clients (surprise)_____________ by the level of support we can offer in such an efficient way.(2016年12月第32题)
What we're trying to do is to have companies ( manage )_____________ and use plastic much more wisely.(2019年6月第31题)