他向我们保证这不会再发生。

He gave us an ___assurance that it would not happen again.

再次，我保证上述两个设备采购请求将为我们公司带来良好的投资回报。

Again, may I give my ___assurances that the above two requests for equipment acquisition would be money well spent for our company.

政府保证新政策将使所有公民受益。

The government provided an ___assurance that the new policy would benefit all citizens.