（2018·江苏）Developing the Yangtze River Economic Belt is a systematic project which _______ a clear road map and timetable.
A.calls for B.calls on
C.calls off D.calls up
It was when I got back to my apartment ________ I first came across my new neighbors.
A.who B.where
C.which D.that
The disappearance of dinosaurs is not necessarily caused by astronomical incidents. But _______ explanations are hard to find.
A.alternative B.aggressive
C.ambiguous D.apparent
—I feel so nervous about the National English Speech Competition tomorrow.
— .
A.I really envy you B.Glad to hear that
C.Sounds great D.Take it easy
Directions：Write an English composition in around 150 words according to the instructions given below in Chinese.
为保护环境，政府提倡垃圾分类，但许多小区的落实情况不尽人意，请你写一封电子邮件向有关部门负责人反映这一现状，并提出合理建议。
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Directions：Translate the following sentences into English,using the words given in the brackets.
1.建议老年人晚上不要喝浓茶，以免睡不着。（in case）
2.在任何情况下，坚持原则、明辨是非都是明智之举。（sense）
3.下周五考试的那天碰巧有一场他们期待已久的音乐会，这令他们非常沮丧。（There）
4.是不是当她很难嚼东西的时候她才下定决心去那家朋友推荐的诊所看牙医的啊？（it）
