The invention of steam engine greatly sped up the industrial revolution, which _____ a lot to the take-off of the world.
It is exactly we behave has changed the world:
--- What do you think about the new teacher?--- _________ the new teacher is an elegant lady, she can be extremely difficult to work with.
You’d better fly somewhere in the west. Then you can _________ a hire car and travel around.
The school sports meet, originally to be held last Sunday, was finally _________ because of the bad weather.
If there are natural resources in a country, it is common for it to export some of them.