The news that scientists so far haven’t found out the cause of bird flu discouraged some WHO officials,________?

Do your parents have the same hobby?—No．My father likes playing____ football while my mother enjoys playing _____piano．

We should love our oceans and do something to them .

Good paper is usedletters, magazines and books. [ ]

Our Maths teacher always makes his class _____ . And we’re never tired of his class.