【B5】A．keepB．keepingC．keptD．to keep

We can infer from the passage that______.A．a good fitness routine is hard to keepB．there a

Im sorry to keep you______for a long time.A．to waitB．waitingC．waitedD．to waiting

【S6】A．keep upB．reset inC．look afterD．add to

The police will need to keep a wary eye on

The police will need to keep a wary eye on

The police will need to keep a wary eye on