Language points
1.They speak English online twice a week.
twice a week一周两次。once a year一年一次。三次以上需用“数词+ times”构成。例:fourtimes a day 一天四次。Take this medicine threetimes a day.这药一天吃三次。

2.Alicia does not hear a reply.
reply既可作名词也可作动词，意为“回答，答复”。reply较正式，多指经过考虑而作出答复。其后除接that从句时是及物动词外，一般只用作不及物动词。其后若接名词或代词作宾语，应加介词to，即:reply to对……作出答复。例:The company didn't give me areply.那家公司没有给我一个答复。He replied that hehad changed his mind.他回答说他改变了主意。

3. It's all thanks to you.
thanks to为固定短语，表示原因，意为“由于，多亏”。thanks不可以改为thank you，to后也不接动词原形，而要接感谢的对象。例:Thanks to theEnglish language,we can learn a lot from othercountries.由于英语这门语言，我们能从其他国家学到很多东西。