1 . In the US, only when someone sits in the driver’s seat ______ driverless cars allowed on roads in certain states. (用适当的词填空)

2 . But Cobb and others ________ (be) now questioning that idea pushing conferences to provide more chances to participate remotely, and changing their personal behavior to do their part in dealing with the climate change crisis. （所给词的适当形式填空）