I think ____necessary for us _____the birds.
—Excuse me,is this the right way to No.1 Middle School?—Sorry,I’m not sure.But it________be.
—Look!Peter is playing basketball on the playground.—It________be Peter.He has gone to Beijing.
—It nearly took me two hours to walk here.—Have a drink then.You________be thirsty.
—Who helped Betty tidy up the bedroom just now?—________.She cleaned it all by herself.
Don’t________all the soap.Leave me some to wash hands with.