The weather in London is so changeable that people always take their umbrellas with themrain.

单项选择题As you worked late yesterday, youhave come this morning.

单项选择题.Mr. Smith, I should tell you this is the fifth time you me for my twin sister.

单项选择题Scientists are convincedthe positive effect of laughterphysical and mental health.

单项选择题Now in China many young peopleimportant positions in the government.

单项选择题Information obtained from libraries is sooner forgotten than .