1) Force N1 _______________. 　　2) This substance _______________. 　　3) The earth _______________. 　　4) The landlord _______________. 　　5) They _______________. 　　1) is 2.5 times greater than Force N2 　　2) reacts three times as fast as the other one 　　3) is 49 times the size of the moon 　　4) wants to raise the rent by a third 　　5) plan to double their investment