We will put off the picnic in the park until next week, ____ the weather may be better.
A. that B. where
C. which D. when
My eldest son, _______ the work takes him all over the world, is in New York at the moment.
A. of whom B. whose
C. of whose D. of which
In 1963 the UN set up the World Food Program, one of ________ purposes is to relieve worldwide starvation.
A. which B. it’s
C. whose D. whom
(2017·北京卷·单项填空）The little problems ________ we meet in our daily lives may be inspirations for great inventions.
A. that B. as
C. where D. when
（2018·天津）Kae, _________sister I shared a room with when we were at college, has gone to work in Australia.
A. whom B. that
C. whose D. her
（2018·北京）She and her family bicycle to work, _________ helps them keep fit.
A. which B. who
C. as D. that
