We keep the old clock for ______ reasons; it was a present from my father.A．serialB．serene

The main function of the hormone is to control the bodys biological clock, ______ we know

We must keep up with the development of the worlds leading enterprises ______we can keep p

We must keep away from some _____, for they will do harm to our health.A.chemistryB.

The local authorities decided to keep the old temple for its historical ______ .A.valueB.b

Would you mind keeping a(n) __ on the house for us while we are away?A. eye B.

–Shall we go for a drink downstairs?--________.Will two o’clock be Ok?