British adventurer and swimmer Lewis Gordon Pugh became the first person to swim in the icy waters of North Pole，to raise awareness of how global warming ______ the polar ice cap.
| A．had affected | B．is affecting | C．affected | D．will affect |
Do you know when the Great Wall _________?
| A．was come into being | B．came into being |
| C．had come into being | D．had been come into being |
He tried his best to solve the problem, _______difficult it was.
| A．no matter | B．no matter how | C．whatever | D．although |
This film_________ the scenes of my childhood.
| A．called up | B．called on | C．called out | D．called for |
—Do you think playing cards is beneficial to our study?
—No，if ________，it can help us kill time when we have nothing to do.
| A．something | B．anything | C．nothing | D．everything |
I feel sure that ________ qualification，ability and experience，you are abundantly suited to the position we have in mind.
| A．in need of | B．in terms of | C．in favor of | D．in face of |