Your hands are very dirty．Go and w them now，Ben!
It often rains （heavy）in this season every year．
（无论什么） difficulties you meet， never give up easily．
On Teachers' Day， students usually make cards to thank teachers． （they）
According to the latest census（人口普查），China has a p of 1，411，78 million.
When a person v a foreign country，it is important to know how to ask for help politely.
The young should do meaningful things instead of with phones all day. （play）
These two sweaters are so expensive that I can afford n of them.
Soft music can help us fall faster and wake up less during the night. （ sleep ）
Helen enjoys （listen） to soft music when she is tired.
﹣﹣﹣ Where shall we watch the light show tonight？
﹣﹣﹣ On the top of Lianhua Mountain． It's in the centre of our city．（ ）
A．backB．middleC．front
Intelligent house furnishings（智能家居） are （wide） used in people's homes now．
The letter "x" often represents a（n） （known） number in some Math exercises．
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