Sally has a sister _______Class Two. They are twins.[ ]

Mum, where did you put my sweater?—Is it _____ black one? I put it in _____orange box near your desk.

Are you satisfied with what she has done?— Not at all. It couldn’t be ________.

Mom, my classmates invited me ________ a field trip. May I go with them? —OK.

Helen and Mary are good friends. _______often help each other.