If nothing ________, the oceans will turn into fish deserts.
| A．does | B．had been done | C．will do | D．is done |
_______ successful docking of Shenzhou VIII with Tiangong-I means that China has managed to take ________ first important step to establish its own space station.
| A．/; / | B．A; a | C．The, a | D．The; the |
--Could I speak to Mr Brown?
-- ______ , I'1l go and see if he is in.
| A．Who are you | B．He isn't here | C．I'm sorry | D．Hold on, please |
The twins look the same. Mr Li find ______ hard to tell one from the other.
A it B them C her D that
--Can I speak to Mr Wang?
--Sorry, he' s out. Can I _____ a message?
| A．leave | B．take | C．ask for | D．want |
--Have you _____ the invitation to the party? --Yes, I have. And I've ______ it.
| A．accepted, received | B．received, accepted |
| C．received, received | D．accepted, accepted |