81.Here we found little snow, as most of it seemed ______ blown off the mountain.
a. to have been b. that it was c. to be d. that it had been
82.______ halfway through the exercise, the teacher changed his mind and collected all our papers.
a. When only being b. When we were only
c. Being onlyd. Having been
83.Some passengers are reading the morning paper, others are talking with one another, ______ nervously for the train.
a. to wait b. are waiting c. waiting d. being waited
84.There’s one thing I dislike about him: he will never admit ______ a mistake.
a. having made b. makingc. being made d. have been made
85.Stan spent half a year ______ material for his new book.
a. to collectb. collect c. collecting d. collected
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