g and running are the oldest andnewest, excellent _________ exercise for all ages and fitness levels.

______in a big city, Peter always prefers topaint the beautiful scenes of country life.

The train ＿＿＿＿＿ at the present speed until it reaches the foot of the mountain at about nine o’clock tonight

26. – If we take a plane, we’ll surely have arrived in Paris by tomorrow morning. – Don’t be so sure, we should _____ the weather factor. _____ it is foggy at that time?

The reason _______ he explained for his being late was ________ his alarm clock didn’t work.