It is reported that 40 percent of the land in Brazil________covered with trees.
A．is B．was C．are D．were
The soldiers put up a strong________in order to protect their country.
A．performance B．breakdown
C．defence D．system
Last year the number of the students who graduated with a driving license reached 200,000, a(n)________ of 40,000 per year.
A．average B．number C．amount D．quantity
Only after they had discussed the matter for several hours ________ a decision.
A．they reached B．did they reach
C．they reach D．do they reach
I don't think ________ possible to master a foreign language without much memory work.
A．this B．that C．its D．it
Child as he was, he ________ a good idea to solve the problem.
A．came up with B．came about
C．came into D．came out with
