through; over; across; into

 through; over; across; into

1) The PLA man jumped ＿＿＿ the water to save the boy．

2) The highway goes under the river ＿＿＿ the tunnel．

3) There is a bridge ＿＿＿ the river．

4) The ship sailed ＿＿＿ the Atlantic．

5) The students walked ＿＿＿ the gate with Mr Liu．

析: ①into。意为“进入；到……里”，含动作方向为由外向里之意。 ⑤through。意为“通过；穿过”，侧重于指从物体的中间穿过。 ③over。此处意为“（位置）横跨；在……上面”，表示动作时为“越过……”之意。 ④across。意为“横过；穿过”，一般指从房间、原野、海洋等一端横越到另一端或两个动作方向成十字交叉状。