It’s important_____ a foreign language. —-I agree with you. We should study hard.

Your sister works very hard ,and .

Americans eat vegetables per person today ______as they did in 1910.

Listen! Is that Pingping playing the guitar? —No. It __________be Pingping. He has gone to Beijing.

______42, Dmitry Medvedev becomes the youngest president of modern Russia. —I know he ever became very ______ his students at university. [ ]