--Can I change for a quiet room? This one is too noisy.--Sure, you can. But you need to pay for________20 dollars.
---I don’t know if his uncle ________. --- I think he ________ if it doesn’t rain .
The boy is afraid ________ cross the bridge, because he is afraid ________ falling into the river.
The writer found ________ difficult ________ English.
The English teacher added that having conversations ________ friends was not ________ at all.
--- Have you ever practice ________ to foreigners? --- Oh, yes. It improves my ________ skills.