根据下列句子及所给汉语注释，在答题卡相应题号的横线上写出空缺处各单词的正确形式。（每空只写一词）

小题1:They've had to put their wedding off until______ (九月).  

小题2: I ________(决心) to carry on with my work then.

小题3:I’m very __________(熟悉) with computer programs .    

小题4:She always________(设计) objects very skillfully.

小题5:I’d like to know what is the ________（长度）of the bridge.

小题6:We shouldn’t spit into the dirt in _____(公共) places.

小题7:He _______(继任) his father as the manager of the company.

小题8:Our country was __________(成立) in 1949.

小题9:If you raise that plan, I will firmly _____(支持) you.

小题10:I would ___________(感激)it if you can help me a lot with my work.

多边形的边数由3增加到n（n＞3），其外角度数的和是（　　）

A．增加

B．保持不变

C．减小

D．（n-3）×180°