_______that I could use a kite to attract lighting, I decided to do an experiment.
| A．Having realized. | B．Realize | C．To realize | D．Realized. |
After a 3-month drought, the rain _______ a good crop this year.
| A．brought | B．managed | C．made | D．guaranteed |
The officers narrowly escaped_____ in the hot battle.
| A．have killed | B．to kill | C．to be killed | D．being killed |
One of the judges __________ to Gana’s film festival was a famous artist from China, Zhang Ziyi.
| A．invited | B．to invite | C．had been invited | D．being invited |
Don’t turn the room __________, as I have just tidied it.
| A．upside down | B．inside | C．outside | D．inside down |
Students are encouraged to _________ the design competition for robots at the university.
| A．take part | B．operate | C．join to | D．participate in |