We should do what we can _____ theendangered animals.`–Yes, it’s duty_____ them.

New York, ______ I visited last year, is a nice old city.

It was years later, with years of training behind her, ________ Yang Yang won the first gold medal in the 2002 winter Olympics.

26 .It is believed that if a book is _______, it will surely ______ the reader.

_I use your computer to send ane-mail—Yes, you ______ But you mustn’t keep ittoo longI’ll surf the Internet after supper