Most Asian women try to be shaded from the sun while touring in Europe in summer, fearing that the strong sunshine may ______ the aging process of their skin.

Her sister is a nurse, so she always wears __________ uniform when she works.

We must act now because time is _______.— Yes. Let’s start.

While Helen ________ the piano，her mother came in．

We have sent some books to the children in that village. However, they still need ______.