New medicines and instruments ______ every day to extend life.
The number of the people present at the concert was _____ than expected. There were many tickets left.
The silk road, _______ Marco entered China, was important for the exchange of goods and ideas.
—Would you please lend me some gas?—Sorry, I have ________ it.
The singer hopes her concert will be like a big party ________ everyone enjoys themselves.
The foreigners are ______ by the ________ progress that the Chinese have made.