Rick has learned a lot about Chinese culture _____ he came to China.

 —Would you like to go for a walk with me?—I’d love to, ________I’m afraid I have to finish my homework first.

— ______ are you going to Guangzhou?— I’m taking the plane. 

 As we all know the H1N1 Flu is so serious, students can’t go into the school _______ they take the temperature and get sure they don’t have a fever.

Tom rushed into the house______ his mother was cooking.