Rick has learned a lot about Chinese culture ____

Rick has learned a lot about Chinese culture _____ he came to China.

#55330

before

when

until

since

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I’m tidy ,  my sister is not.

#56145

and

but

under

always

We’ll climb the mountain _______ the weather is bad this weekend.

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when

until

unless

____________ he is poor, he is happy.

#56858

Even though

Because

But

I met a friend of mine _________ I was walking along the street.

#56938

before

because

since

You shouldn’t keep a pet _______________ you have enough time to care for it.

#56035

unless

though

when

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