--- I'm not sure. But when I got back, it was gone.
(2) --- Was it there ______ you put your bike to see your friend off?
--- I'm not sure. But when I got back, it was gone.
A. that B. which C. while D. where
78. (1) Scientists generally agree that Earth's climate will warm up over the next 50 to 100 years ______ it has warmed in the 20,000 years since Ice Age.
(2) Scientists generally agree that the Earth will exist ______ it has done in the past.
A. as long as B. as much as C. so long as D. as well as
79. (1) --- Excuse me. Did you notice whether the No. 108 bus had gone by?
--- Not ___ I've been standing here.
(2) ____a car reaches the end of its life, it is taken apart and any part that can be reused is sold off.
(3) He never thought that his success came ______ he least wanted it.
A. U(u)ntil B. O(o)nce C. S(s)ince D. W(w)hile
80. (1) This is an illness that can result in total blindness ______ left untreated.
(2) ______ you want me to fire you, I suggest you stop wearing sports clothes at office.
(3) You must keep on working in the evening ______ you are sure you can finish the task in time.
A. since B. if C. unless D. until
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