It is diving _____ great speed that often causes serious accidents.
—Do you ______ the idea of living a low-carbon life?—It sounds tough, but it is a tendency.
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.