---Have you seen____pen? I left it here this morning.---Is it ____black one? I think I saw it somewhere.
The public transportation in this city is very convenient, where many buses run ______.
The purse found on the playground matches the ______ by Mary, so it must be hers.
The road ______ for vehicles is under repair. Drivers are required to take some other routes.
—When shall we go planting trees in the hill? —______ it begins to rain, so they don’t need watering.
World Expo 2010 Shanghai China, a grand-scale global event, has ______ the significant theme “Better City, Better Life.”