He started to learn English in 1990 and in the years ________ he kept on using it in his work.
---How did your students express their thanks to you on Teachers’ Day?---A gift together with many flowers ______ sent to me.
Only when I left for America ____________ how much I missed my parents.
Tina apologized ______ her mother _________ breaking her favourite necklace.
Making friends is sometimes hard _________ when you don’t know what to say.
They did the experiment in the lab _______ was named after Professor White.