1.You'd better come back earlier ___ it is getting colder.
  A.as
  B.and
  C.but
  D.or
2.He was walking along the sands ___ he saw a big footprint
  in the sand.
  A.while
  B.when
  C.as
  D.which
3.___ he was sleeping, they stole his clothes.
  A.While
  B.Before
  C.Until
  D.After
4.I don't think you'll be able to understand that ___ you are my
  age.
  A.even
  B.only when
  C.as if
  D.even when
5.Leave a basin of water outside in freezing weather ___it will
  soon be covered with ice.
  A.or
  B.but
  C.as
  D.and
6.What he said is strange, ___ it is true.
  A.but and
  B.and but
  C.yet and
  D.and yet
7.Jack was very tired ___ he played tennis all afternoon.
  A.if
  B.as soon as
  C.because
  D.before
8.Though ___ he said was of little help to me,I thanked him all the
  same.
  A.what
  B.which
  C.that
  D.who
9.I often visited the British Museum ___ I was staying in London.
  A.while
  B.until
  C.during
  D.through out
10.___ he finished his work, he left hurriedly.
  A.As soon as
  B.As if
  C.Unless
  D.In order that
11.You'll surely make progress ___ you work with a strong will.
   A.unless
   B.until
   C.as long as
   D.as well as
12.___,I am sure that he is honest.
   A.No matter people say
   B.What people say
   C.Whatever people say
   D.It doesn't matter people say
13.It won't be long ___ you regret what you've done.
   A.after
   B.before
   C.since
   D.then
14.___ the letter,tears kept coming to her eyes.
   A.To read
   B.Reading
   C.She was reading
   D.While she was reading
15.I'll leave him a note ___ he'll know where we are.
   A.so that
   B.so as
   C.in order
   D.for
16.It is often said that an American starts a speech with a joke,
   ___ a Japanese has an apology to make.
   A.which
   B.what
   C.while
   D.that
17.___ the rain has stopped, let's start again.
   A.For
   B.Because
   C.Now that
   D.That
18.Mr Smith is a warm-hearted person. He helps me ___ I ask him to.
   A.whatever
   B.whenever
   C.only
   D.however
19.He took all ___ was here and left nothing.
   A.what
   B.which
   C.that
   D.whose
20.It's almost three years ___ I last saw her.
   A.since
   B.when
   C.that
   D.after


