Many scientists have believed that theremay be a _________of life on the Mar

Look! What’s on the ground— Oh, it’s my sweater. Please .

— Mr Anderson should either keep the dog in the house or________?— I’ll have a word with himHe often listens [ ]

.At school, Mike _______ everyone，classmates and teachers.

Lin Tao, do you want to visit the Great Wall, —Sure, Wen Wei wants to.