Stephen Hawking believes that the earth is unlikelyto be the only planet __________ life has developedgradually.
The population of city________ larger than that of any other city in the country.
Nothing except some chairs _____ there.
Many sheep _______ eating grass by the river.
At the bus stop _______ a solider and two young people on their way to the village.
Such _________ the difficulties that we are now faced with.