问题描述：
1 He is able to swim __the river 1over 2.above 3across 4 throught
2 The boat is passing __the bridge
1 under 2through 3across 4over
3the sunlight came__the widows
1out of 2 through 3over 4above
需要原因,
2 The boat is passing __the bridge
1 under 2through 3across 4over
3the sunlight came__the widows
1out of 2 through 3over 4above
需要原因,
问题解答：
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