Come on，Sam． Believe in （you）．You can work out the problem on your own．
Mr．Zhang，your is excellent！Have you ever studied abroad？（pronounce）
I don't use my mobile phone a lot at night，as its blue light is to my eyes．（harm）
LEGO is one of the that can develop children's creativity．（toy）
I offered my seat to an elderly man，but he refused ．（polite）
Little Tom has just celebrated his birthday．（nine）