A:培育能产生乙肝疫苗的酵母菌
B:培育高产、优质的“太空椒”
C:培育能生产激素的“超级绵羊”
D:培育分解石油的“超级细菌”
You ____ a ____.
You will achieve nothing ______ you work hard in a proper way.
We will hear what he must say and observe what he will do for what he says and what he does often _______.