We expected there no problem with the publication of the book by now, but it is still being printed.
| A．being | B．to be | C．to have been | D．having been |
It is very important for us to _______ between good and bad.
| A．reject | B．realize | C．range | D．distinguish |
A great explosion _______ in a chemical factory in Hangzhou several months ago.
| A．occurred | B．occurred to | C．has happened | D．has taken place |
I’ve never dreamed of _______a picture on the wall.
| A．there be | B．there being | C．there to be | D．there is |
The Louvre in Paris is one of the most famous museums, housing many priceless _______.
| A．memories | B．catalogues | C．treasures | D．identities |
Peter, a superstar in environment protection, reduces plastic and other _______ through DIY.
| A．goods | B．ruins | C．wastes | D．objects |