根据句意和汉语注释，写出单词的适当形式。
Your spoken English is so poor, please correct your ___________（发音）.
His parents have_______________（答应）to buy a new mobile phone for him．
The manager is strongly against ___________（回复）to that foreign company at once.
Lu Xun is one of the ___________（先锋）of modern Chinese culture.