Why does Jane look unhappy today?.— A letter from her brother _________ a wave of homesickness.

Green economy offers a new model ________ people could both protect the climate and develop the economy, according to what Li said at the International Cooperative Conference on Green Economy and Climate Change.

As students, we ________ study hard to make our country more beautiful and stronger.

_is your birthday ? – It’s in February, 2001.

Our afternoon class starts _____ 2 p.m., I must come to school before 1:50. [ ]