-- Is this a pen? -- Yes , ________ is.A. this B. that C. it
My phone is broken.It________just now.
—Sorry,Mr Green.I________my English book at home.—That’s OK,but don’t________next time.
Miltie________a picture when Mr.Green came in.
—Always look around________you cross the street,David.—OK.I know,Mum.A.untilB.beforeC.unless
The thieves ran away at once when the burglar alarm(防盗报警器)________.