In the near future, more advances in the robot technology by scientists .
________the birthrate down by 10%,the number of the population has decreased.
The army went ________the thick forest and at last came to a little river.
You have made several mistakes in your exercises but ________you have done well.
The water lever has risen ________10 cm and up to 100cm in the last days.
The touch they had both kept in ________many years broke.