Sixteen-years-olds shouldn’t ______ to go to an Internet bar.
Can you tell me how _______ the train station?
The West Lake is great. People ________ it every year.
The boy has _______ questions to ask his teacher in every class.
It’s not safe(安全的) for an ________ child to swim in the river.
He really likes English and often ______ English after class.