I've___to wait here until the lecturer arrives.

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I've___to wait here until the lecturer arrives.
A.being instructed B.been instructed C.instructed D.instruct

2.Many people are against new drugs___on animals.
A.be tested B.being tested C.test D.tested
3.When I entered the room,everyone was laughing___.
A.clearly B.mournfully C.sadly D.loudly
4.They have lauched a man-made satellite___.
A.success B.succeed C.successfully D.successful
5.We must work hard to___a good knowledge of English.
A.read B.study C.acquire D.learn
6.Jill smiled___because he didn't know how to help his friend.
A.sympathetically B.happily C.loudly D.continuously
7.The little boy___his mom when he heard her laughing.
A.turned attention to B.turned his attention to C.paid attention on D.paid his attention on
8.We___the fallen tree away from the road.
A.made B.took C.brought D.dragged
9.They___around for hour,looking for their son.
A.would wander B.were wandering C.wandered D.have been wandering
10.She suddenly___after she heard of the accident.
A.broke tears B.broke in tears C.broke out tears D.broke into tears

1、选C
音量不变是指声音的大小即响度不变,快速播放同一段录音,发出声音的振动频率加快,声音的音调变高．所以C正确
2、选D
A、老师用扩音器讲课,增大了声音的响度,不是改变音调；
B、摩托车上装消音器,在声源处减弱了噪声,不是改变音调；
C、用大小不同的力敲击同一个音叉,振幅不一样,声音的响度不一样,不是改变音调；
D、依次敲击装有不同高度水的瓶子,瓶子振动的快慢不一样,声音的音调不同,正确.
是否可以解决您的问题?

Please wait here until I ______ you. The lecturer _________ will be here tomorrow. I can't wait until he gets here we will wait here until the heavy rain-----(stop) 1.I will wait ____ the last train arrives A.by B .by the end I‘ll wait here until he____doing his homework finish应该用什么时态 I think we must wait here ____ he comes back.填until还是before? will stay here wait for you...until i dad,you know? I will wait here until you come back.(转换为同义句) 单项选择并说明理由1 I will wait here until he __ back.A will wait B 一道初中英语语法题We'd better __ here __ the rain stops.A.wait,until i am still and wait here in the silence