【C8】A．atB．inC．aboutD．for

That place is（)the south of the city.A.atB.inC.onD.to

A．AtB．InC．During

The first group was given five doses______weekly intervals.A．atB．inC．onD．for

【C18】A．atB．inC．forD．on

【C17】A．atB．inC．toD．into

【C2】A．AtB．InC．ByD．Of