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16.Here you can see streams ______ downinto the valley day a

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16.Here you can see streams ______ downinto the valley day and night.
A.run B.ran C.running D.to run
17.Stream water becomes muddy when ______soil from the hill slopes.
A.wash away B.washes away C.washing away D.to wash away
18.They stood there for an hour ______ theboys _______ the game.
A.watch; play B.watch; playing C.watched; played D.watching; playing
19._______ what had happened to him ,theylooked worried.
A.Not knowing B.Knowing not C.Having not known D.Having known not
20.Muddy water _______ soil cannot runstraight down because there are terraces on the slopes.
A.carries B.carrying C.carried D.being carried
16.Here you can see streams ______ downinto the valley day a
ccdab非谓语的考点