Do you think necessary to do a bird count ?Yes , we must count them at least once a year
It’s _______ good weather _______we can go out to enjoy a pleasant picnic.
Michael Jackson, a superstar, _______ at the age of 50 in Los Angeles.
—What ______the number of the students in your school?—About four thousand and seven hundred. A number of them ______ from the countryside.
beautiful T-shirt you’re wearing !
---I have been to Changsha . --- . I think it's nice .