That evening, _____ I will tell you more about later, I ended up working very late.
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.
We must do something to ________ the factories sending out poisonous gases so as to keep the city clean and beautiful.