16.Here you can see streams downinto the valley day and night.A.run B.ran C.running D.to run17.Stream water becomes muddy when soil from the hill slopes.A.wash away B.washes away C.washing away D.to wash away18.They stood there for an ho

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16.Here you can see streams ______ downinto the valley day and night.A.run B.ran C.running D.to run17.Stream water becomes muddy when ______soil from the hill slopes.A.wash away B.washes away C.washing away D.to wash away18.They stood there for an ho
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

c b a c c

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