'have them completed' is correct and usable in written English.
You can use this phrase when you want to express that something needs to be finished or accomplished. For example: I need to have these reports completed by tomorrow morning.
Many Whole Foods stores stayed open late on Sunday night to make the price changes, but Amazon had given stores an 11 AM deadline to have them completed.
Barlow said they hope to have them completed before the fairgrounds authority and the council meet Tuesday to vote on the agreement.
Although over seventy-five cars were entered in the race, most of their owners did not have them completed in time for race so only three cars and six early motorcycles showed up.
Speed up the process by checking to see if your local agency allows you to print forms from the Internet and have them completed when you visit the office.
Before starting the interview, have them complete the informed consent form (example here).
If you also intend to capture video/audio/photos, have them complete a record release form (example here).
Before starting the interview, you may want to have them complete the informed consent form (example here).
To give your team some hands-on practice, charge them with selecting a topic of their own interest (such as "whether meetings start on time") and then have them complete the exercise described in this article.
The state is spending $94 million to help local health clinics, community groups and labor unions reach residents — many who have lived without health insurance for years — and have them complete the often bewildering process of signing up for coverage.
Have them complete the favor.
