Mary told me her brother had arrived _______ Kunming. [ ]

We are living in an age ____________ we treasure very much, because it sees man’s rapid development.

There is no doubt _____ China has made rapid progress in space exploration.

It’s getting dark, but Mr. Johnson is still at his office. —No surprise. Who else can ______ he does?

The Smiths have moved to Miami, Florida, ____ they dreamed long of living in.