I often see him working hard in his spare time —________he has won the scholarship from time to time

Must I clean the room now —No, you . You can do it tomorrow.

u swim in a river or lake, be sure to investigate is below the water surface. Often there are rocks or branched hidden in the water.

There is no doubt________man will continue to explore the vast universe in the future, but the rate at which we approach depends on the development of technology.[ ]

The place of interest is really beautiful。—Yes，Mr Whitearight place.