Finding information in today’s world is easy.The is how you can tell if the information you get is useful or not.
---This is useful machine which was made in ________thirteenth century
---Mum,_______ I watch TV? ---No. Unless your homework _______________.
__________terrible luck he had yesterday!
Yesterday I met Jim. We ____________ each other since we _________ middle school.
---When did you return to China? ---_________________.