The North Pole is ____ all the white snow here and there all the year round.
There is no doubt ________ only by lifelong learning can we keep up with the advancing society.
Two special government projects are also ________ to protect the river.
I was going to do some shopping in Golden Eagle, but ________ watching TV at home because of tiredness.
________ in a heavy traffic jam in a taxi while you are hurrying to the airport is quite an unpleasant experience.
Whatever he does, once he set up a goal, he would start pursuing it without _________.