1.Please put your hands [in front of you / behind you]
2.I can't cut this iron wire in half.
3.I can't unscrew this bottle cap / I can't screw this bottle cap on tight.
4.The elevator is going up / going down.
5.The plane is ascending / descending / touching down.
6.The plane [ascended 5000 meters / descended 5000 meters].
7.Biking up this uphill part is very tiring.
8.Be sure to control your bike's speed on this downhill part.
9.This temple sits at the [foot of the mountain / halfway up the mountain / on the top of the mountain.]
10.The event unfolded outside our expectations.
哈哈 刚刚醒来看见了你的题目,就先答这个咯!4. The elevator is going up / going down.5. The plane is ascending / descending / touching down.飘飘，第四句里面的，going up , going down ,是不是也能用 ascending , descending 来替换呀？嘻嘻是的，都可以。嘿嘿。