_____ they reached the centre of the city, they st

_____ they reached the centre of the city

They are sure they have all the facts they need to ______ the existence of a black hole.A．

At the shopping centre they went up in the ______ to the shops on the second floor.A．stree

It was five o clock in the afternoon______they reached the top of the mountain.A．thatB．whi

Only when they _____ the importance of the plan

What do some of the city people feel when they live longer in the countryside? They_______