The new theme park, _________ last year, has received 27 million visitors so far.
A. open B. opened
C. being opened D. to open
Dogs have a far wider hearing range than humans, _________ them able to detect sounds far above a human's hearing limit.
A. making B. made
C. having made D. to be made
A new engineer was appointed to deal with the products _________ by customers.
A. returning B. returned
C. to return D. return
_________ your strengths and weaknesses will help you achieve your dreams.
A. Known B. Know
C. Knowing D. Being known
We really appreciate our learning environment, _________ we can have direct communication.
A. whom B. which
C. where D. when
Sometimes tests are needed _________ doctors discover exactly what's wrong with your body.
A. since B. before
C. although D. if
