We students should __________ ourselves __________ knowledge, for the competition nowadays is very fierce.
We often think of the days _____ we spent together on the island.
After supper she would sit down by the fire,sometimes for _____ an hour,thinking of her young and happy days.
_____ they reached the center of the city, they stopped the car at a bar.
Mr. Mason, who holds the office of chairman, has _____ heavy a work load that it is difficult for him to travel.
Beer is the most popular drink among male drinkers, _____ overall consumption is significantly higher than that of women.