----It’s time to go to bed,Jack.----OK._________, Mom.
John didn’t know ____ the medicine. A. what to take B. how to take C. where to eat
This is the question______ we are talking about now. A. which B. who C. what
There is _____800-meter-long road behind____ hospital. A. an, an B. an, theC. a, the
He improved his English a lot listening to the radio.
The students hurried to the classroom the bell rang.