Brain, like muscles, also needs some kind of exercise and nutrition. The more you use your brain in the right direction, the more you ________ enhance your ability.
There is a board by the road, which _____ “Parking_____!”
In order to produce more grain, it________that the area of farmland_____.
---Do you like the new pen? ---Yes, it_____ smoothly.
.The Red Army ____ more than 25,000 li and arrived at North Shanxi at last.
News reports say peace talks between the two countries _____ with no agreement reached.