The camera________in 1827 by Joseph Nicephore Niepce.
We had _______ 7-day holiday during this National holiday, but some of us felt unhappy because of _______ heavy traffic on the highways.
My father wants to know _________ next week .
— I haven’t got a partner _________ .— Maybe you can ask John for help.
Your teacher will not be happy ________you finish your homework.
I often warn children ____ in the deep river.