1. ____________ (他一到), Professor Lin starts _______________ (一场激烈的辩论)Mr. Chan ______ (介词)the serious situation of _______________________ (环保). From_____________________/ In ______________ / As __________________ (在他看来), ____________________ (工业废物) is making the earth dirtier and dirtier. These factories should not try ____________________________ (逃避他们的责任).
