36. Scale is an instrument for showing  people or things are.
A. how heavy B. how tall C how old D. how high
37. I tried to cheer him  , but he just kept staring out the window.
A. on . B. up C. off D. out
38. Laura and Jill go jogging every day  _ keep in contact with each other.
A. to B. so that C. so as for
39.  I have to get up early I set the alarm for five o'clock  oversleep. 
A. so as to B. so that C. in order not to
40.  I put the heater on  the plants warm.
a. keep B. keeping C. to keep D. for keeping