— How many people are expected to come to your party tomorrow afternoon– I send out thirty invitations but one third _____.

Do you know who ____ the tomb of Emperor Qin and who ___ the mobile phone—No, but we may ask our teacher.

Lydia, what did our headteacher say just now? — Every boy and every girl as well as the teachers who to lead the group asked to be at the school gate before 6:30 in the morning.

He sent me an email，________to get some further information for his research.[ ]

Why are the lights in the teachers’ office still on—There ________ be some teachers working there.