Listen! Our science teacher _____the use of the robot.
Ann has got a letter from her best fiend. It makes ___ quite excited.
The villagers plan _____a new bridge over the river.
A lot of trees _____in our city in spring every year.
Protecting ourselves is one of _____ things we must do
您目前分数偏低，基础较薄弱，建议加强练习。