沥青的针入度越大，表示沥青的粘度越大。( )
参考答案：错
解析：(正确：针入度越大，表示沥青的粘度越小)
Dear passengers, please remain _____ until the bus totally stops. [ ]
A. seat
B. seated
C. seating
D. to be seated
—Do you know the song Come on, Haixi!—Yes, and I _________sing it well.
A. must B. can C. need
