_ for two days, Steve managed to finish his report on schedule.

Nowadays, many people walk to work ________ Copenhagen Conference calling for living a lowcarbon lifestyle to cope with global warming.[ ]

Seeing the happy scene, a lot of sweet memories ________.[ ]

Dad always tells me not__________only for tests.  If that’s all I’m doing, he says, I will learn very little.

He promised _____his old friend during his stay in Tianjin.