The cat made a lot of noise last night. It ______________ a baby crying.

e another wonderful discovery, _______ of greatimportance to science.

It was a difficult time, but we never________ hope.

MrSmith is said to have retired and he is living in the country now.—- YesHe ________ in our factory for 35 years! What a good worker!

You should take ____________ measures to improve your working conditions．