Busy as they are, parents should ______ at least two hours every week to spend with their children.
The Red Army soldiers had to fight________ all kinds of difficulties in their fight________ the people’s freedom.
Some people fear that ________ air pollution may bring about changes in ________ weather around the world.
Only when I left my parents for Italy________ how much I loved them.
Though the girl hasn’t lost________ heart to him,he hasn’t lost________ heart.
The two drivers could do nothing but________ the truck.