“Power sleeping” for more hours on weekends is only a _______ solution. There is no substitute for getting a good night’s sleep on a regular basis.

________ in the traffic jam,they had to wait for two hours[ ]

_______ can you read in English — About 100 words a minute.

If you don’t study English all thetime, you’ll have a difficult time ____ it in the future.

下列各句中，没有语病的一句是