Joan is one of the best writers who __________ published a lot of books.
| A．has | B．have |
| C．have been | D．are |
It is said that the early European playing-cards ______ for entertainment and education.
| A．were designed | B．have designed | C．have been designed | D．were being designed |
Gaddafi’s failure in Sirte _________ him the last opportunity to reestablish the government.
| A．spent | B．took | C．cost | D．paid |
I suppose by the time I come back next year, all these old houses south of the Baoshehe River ________ down.
| A．will have been pulled | B．will be pulling | C．will have pulled | D．will be pulled |
The ability _______ an idea is as important as the idea itself.
| A．expressing | B．expressed | C．to express | D．to be expressed |
Some insects _______ the colour of their surroundings to protect themselves.
| A．take in | B．take off | C．take on | D．take out |