Open ClozeOefening 40 van 101

The swifts are a family of highly aerial birds (0) THAT people think belong to the same family (1) .......... swallows. This is not true, because they are, (2) .......... fact, more closely related to hummingbirds. It cannot be denied that there are some strong similarities (3) .......... swifts and swallows. This is…