Can you tell me _____ the birdwatchers in Zhalong Nature Reserve? I only know that _____ of them are from our school.
My brother __________ to Canada to learn English in 2005.
Jim, hurry up, ________ we’ll be late for the concert.
Look! The students are playing on the playground. Some are running, some are playing basketball, ________ are watching.
--_____ do you visit your grandparents, Jane? -- Once a month.