Tom wants to know if___________ a picnic tomorrow.— Yes. But if it _________, we will visit the museum instead.

He was knocked down by a car ____ he saw it run toward him.

Is this his pencil —_______________. Mine is green.

ane is lucky to have got the well-paid job.一Yes, ＿＿she is inexperienced and young.

It is _______ unusual thing for us to find ________ UFO.