26．Before selecting the curtain for your newly-decorated house，it’s important to know what colors look great _________the wall paper

Jay Chou , a young singer, is quite popular___the public. He’s made a remarkable achievement ___a boy of his age.

Some pre-school children go to a day care center, __________ they learn simple games and songs.

Would you please help me with the box—_____ .

What is upsetting you, dear—________ it is necessary for us to move our home to the city.