1. Training new staff should (conduct) ____________ as soon as possible after they are hired. (2018-06)2. The contract won’t come into effect until it (sign) ___________ by the legal representatives of both parties. (2018-12)3. When ___________ why they are looking for jobs at new companies, some of them say they want more challenges. (2018-12)Aasked B ask C asking D to ask4. When they entered the area, the visitors (required) _______________ turn off their smartphones. (2017-12)5. Our clients (surprise) _____________ by the level of support we can offer in such an efficient way. (2016-12)6. For social robots to work successfully, they have to (accept) ____________ by humans. (2016-06)7. Quotations and samples will (send) ____________ to you as soon as we receive your specific inquiries. (2015-12)8. It is reported that an international conference (hold) _______________ in London next week. (2014-12)9. Accordingto the regulation, inspections ________ to ensure that the systems are in good condition. (2017-06)A.demandedB. have demandedC. be demandedD. are demanded