David didn’t give up ______ he had failed in the experiment four times.

David didn’t give up ______ he had failed in the experiment four times.

#58224

while

though

since

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Plane will be very large _______ flying will be very cheap.

#57924

and

but

---Finish your homework,          you can’t play computer games, Jim.---All right, Mum.

#55661

but

till

and

 In a nature reserve , it’s ___ to hunt ______ fish there .

#55961

important , and

unable , but

incorrect , or

correct , or

The bus driver always says to us ,“Don’t get off________ the bus stops.”

#57772

when

while

until

The boy didn’t go to school ____________his illness(疾病)。

#58160

because

because of

but

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