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 I have never ....... her before.

 That's what I would like ....... Christmas.

She hasn't come home ........

 Can you hear what he is .......?

I posted the letter one month ago. It is very ……… that my friend hasn't received it  yet.

The ……… of scientific thinking has institutionalized the idea that knowledge has to  progress and can do so only through research.

I didn't want to do it in the past, but now I ______.

شكل زير يك موج سينوسي را در لحظهاي از زمان نشان ميدهد و موج در جهت محور x در طول ريسمان كشيده شدهاي حركت ميكند. كدام مورد دربارة ذرات a، b و c درست است؟ عکس شکل رو باز گذاری میکنم .لطفا توضیح کامل بدید .

_______sister lives in Italy.

I couldn't eat ______ before the exam.