The boy（）the dog with a thick stick but the dog did not yield.

单项选择题After several days of heavy rain the roof（）with a loud noise, crashing (坠落) onto the ground.

A.came out
B.came down
C.came on
D.came at

单项选择题The rain stopped and the sun（）to shine.

A.came down
B.came out
C.came off
D.came on

单项选择题She（）a new idea for increasing sales.

A.came up with
B.came up at
C.came by
D.came for

单项选择题The father advised her to avoid the mistake made by many couples of marrying for the wrong reasons（）he found the young man charming and intelligent.

A.as though
B.even though
C.because of
D.due to

单项选择题There have been many（）in their marriage but they still love each other.

A.ups and downs
B.from head to toe
C.time and again
D.over and over

单项选择题The local government tried its best to ensure each of its citizens a（）supply of food at regular intervals (时间间隔).

A.consistent
B.continual
C.continuous
D.numerous

单项选择题The United Nations Conference on Global Environment, which took place earlier this year in Vienna, was a very（） meeting.

A.productive
B.communicative
C.aggressive
D.protective

单项选择题We watched the plane（）behind the clouds.

A.disappearing
B.disappeared
C.diving
D.dived

单项选择题Pipes made of plastic are now widely used in building as they are light and do not become （）in water.

A.ripe
B.instant
C.rotten
D.mature

单项选择题They were under the（）that the company was doing well, but in fact it was in serious trouble.

A.conclusion
B.expression
C.enjoyment
D.illusion