Debian Stretch won't resolve hostname, but IP works

I have configured Stretch networking for eth0 (it picked ens3), after setting:

so now I have:

which works, so:

And I can ping google nameservers like:

But not google itself, or any other domain. My hosts file looks like:

My resolv.conf looks like:

but I can ping my gateway so the default route seems okay:

my /etc/nsswitch.conf says:

What is missing? Should I be doing something else in Stretch?