41.  I'd better put my heart into my study.

42.  In the ordinary time, I don't think it important to do experiments, so I didn't put my heart into it.

43.  They tryed their best to put out the fire.

44.  A moment later, the fire was put out.

45.  After supper, the day have been dark.I kindled the candle of the lantern, then I put it up on the wall outside.

46.  Finish playing chess, I put a disk into the CD-ROM.

47.  Many buildings and houses have been put up.

48.  At the first week, all students are put their heart into study.

49.  Then he tried to put out the fire with two boys.

50.  After a moment, firefighter arrived, they put out the fire quickly .