According to the data, China supplies more than 90 percent of the world’s rare earth metals, but its reserves only about one third of the world’s total.
He paid for a seat, when he _____ have entered free.
—Do you know where David is? I couldn’t find him anywhere. —Well. He _____have gone far—his coat’s still here.
If the new arrangement doesn’t _____, we’ll go back to the old one.
All the girls swam in the lake except two, who _____ halfway.
We’re so busy that no one in the office can _____ for any other work.