372. In order to expand its foreign market, the company decided to_______ its products and provide more varieties to the customer.
(A) exceed
(B) dismiss
(C) retrieve
(D) diversify
377. The secretary was requested to be more precise in revising the contract so as to avoid _____ and misunderstanding.
(A) capacity
(B) temptation
(C) ambiguity
(D) brutality
519. A new bridge____ over the river by the workers. People will see a brand new one very soon.
(A) is being built
(B) has built
(C) was built
(D) had been built