By the time Jack returned home from England, his son _____from college. [ ]

With the second ring road overpass _______ at present in Chengdu, the local citizens have to choose another way to avoid traffic jam.

________ we don’t care about ourselves, we don’t want our kids to live in a bad environment

Many teenagers ________ the old and they often offer their seats to them on buses.

Steven so active and lively after so many years, which I didn’t expect.[ ]