China has invested 15.2 billion yuan so far this year to support pig keepers, in a(n) _______ to ensure enough pig supplies.
The new airport will be_______ from all directions.
By the time Juan gets home, his aunt _____ for Puerto Rico.
Robert is said _______ abroad, but I don’t know what country he studied in.
________leaves the room last ought to turn off the lights.
Great changes have take place in that school. It is no longer ______ it was twenty years ago, _______ it was so poorly equipped.