【C3】A．requireB．receiveC．obtainD．achieve

【C16】A．to requireB．requiredC．requiringD．are required

A．recoverB．receiveC．admitD．accept

【C5】A．requireB．requestC．urgeD．appeal

【C17】A．RequireB．RequiringC．To RequireD．Required

【C6】A．payB．receiveC．offerD．add

【C8】A．requireB．demonstrateC．performD．fulfil