Thetwinsaresoalikethatitsalmost___(possible)totellthemapart.

Another worry is that telecommunication systems may isolate people ______ each other.

Weallknowaboutthe_____thatsmokingcandotoourhealth.

When he was arrested, Terry_________in crime for years.

The rediscovery of this species of birds is one of the most___(ordinary)scientific findings in recent years.