【C4】A．assureB．reassureC．secureD．ensure

I ______ you that these goods will be delivered to you tomorrow morning.A．assureB．ensureC．

We ______ to refund your money if you are not satisfied with your purchase.A．assureB．ensur

The United States decided to take measures to ensure the security of its embassies whenA．a

Please______us of any changes in your circumstances when you are away from home.A．assureB．

【C3】A．concerningB．followingC．finalizingD．ensuring

【C6】A．encouragesB．enablesC．enforcesD．ensures