1- while I write a letter, my mother arrived (past continues tense) 2-Ahmed do the housework (present perfect) 3-Suha do her homework (past simple tense) 4- Ali write a novel (present perfect). 5- what be you do when it started to rain (past) continues tense)

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Asphalt Binders and Mixtures

Asphalt binders are subsidiary products procured during the refining process of petroleum while manufacturing gasoline, diesel, and similar petroleum products. Asphalt binders are obtained from the residue that remains after the distillation of petroleum, this residue is further subjected to steam distillation and oxidation to remove the traces of gas oil present in the residue. Certain additives or modifiers are also added to asphalt binders to alter them to suit different applications.