Did Linda have a good time in Beijing?——Yes．She enjoyed__________very much．

Is that boy Alan?—No, it ______ be him. He left for Beijing yesterday.

They had _______ wonderful train ride to Chengdu before they went on to _______ Mount Emei by bus.

He will call me as soon as he ______ the city.[ ]

There will not be enough space to _____ the earth in the future. [ ]