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完形填空.Do you know how to plant a tree First ,the __47___ must

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完形填空.
Do you know how to plant a tree First ,the __47___ must be just right --- neither too wet nor too dry .It’s best to plant trees in __48__ because it’s warmer .Dig a hole __49_ for the tree .But the hole should not be __50__ deep .Second ,knock a long ,strong stick into the earth ___51__ to the hole .__52__ sure that it is straight .Then put the tree in the hole ___53__ it is straight .After that ,you should put the earth back in the hole again ,and __54_ it down hard with your foot several times .Tie the tree __55__ the top of the stick to keep it straight .At last you should water it well as _56___ as possible .
()47.a.ground b.floor c.tree d.heat
(c)48.a.spring b.summer c.autumn d.winter
()49.a.long enough b.enough long c.large enough d.enough large
()50.a.very b.so c.much d.too
()51.a.far b.next c.up d.away
()52.a.Make b.Get c.Do d.Let
()53.a.and b.that c.such that d.so that
()54.a.pull b.take c.push d.draw
()55.a.at b.to c.in d.on
()56.a.quick b.soon c.often d.good
47.a 48.a 49.c 50.d 51.b 52.a 53.d 54.c 55.b 56.