I haven’t heard from Bill _______

I haven’t heard from Bill ________ he left here.

#56844

when

before

since

while

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My sister is only five, but she always tells me ____ my pictures are good or not.

#58117

whether

that

how

This is a cheap and simple process(过程), ____ ,there are dangers.

#55625

but

because

However

 It’s widely known that you won’t achieve success _____ you work hard.

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unless

whether

until

_________ she is a little girl, _________ she knows a lot.

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Though, but

But, though

Though,/

But. /

 ---There is no doubt _______ he will come tomorrow.---But I doubt _______ he will come here on time.

#56137

that; that

if; that

whether; that

that; if

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