一本书a页,已经看了b天,每天看15页,看了______页,还有______页没有看.
看了:b×15=15b(页);
还剩:a-15b(页);
故答案为:15b,a-15b.
My father gave his old car to me and he is_____a new car.
A.considered buying
B.considered to buy
C.considering buying
D.considering to buy
妊娠期高血压疾病的病因有( )、( )、( )、( )、( )、及( )。