While dancing happily at home，________．[ ]

StephenHawking believes that the earth is unlikely to be the only planet _lifehas developed gradually.

The hotels launched new services to cater ____ the growing number of Chinese visitors to the region.

A tourist will easily lose his way in Shanghai_____ hehas a map or a guide.

We are considering the students’ request _________ theschool canteen should provide more kinds of food especially during the weekends