He always helps__________ the housework.A. with B. for C. in
After reading for an hour, you'd better_______ the green trees for a minute or two.
Do you need help _______ your Maths homework?
Which floor do you_______ this tall building?
-How many students are there in your school?-There are about eight_______ students.
-_______?-Yes. This is Kitty speaking.