Alice _______ in the street when a thief stole her bag and ran away.

The cleaners must prevent the street______.

Look at the boy running on theplayground. Is it David—It ______ be him. I saw him go to theteachers’ office just now.

y find the key to themaths problem on page 107 —Ah, it’s so simple I wonder why I ________ of that

Ifyou______anyproblemswhenyouarriveattheairport,givemearing．