【C2】A．afterB．whenC．whileD．once

【C8】A．ifB．whenC．whileD．as

John fell asleep he was listening to the music.A．afterB．beforeC．whileD．as soon as

【C2】A．whereB．whenC．thatD．which

【C15】A．takes afterB．takes onC．takes upD．takes for

The train had left（) Apce hurried to the railway station.A. afterB. asC. whileD. when

【C2】A．ifB．whenC．althoughD．since