I can still remember that it is since the 1990’s, _____ we began to use cell phones,_______ the number of mobile users has greatly increased．

I can still remember that it is since the 1990’s, _____ we began to use cell phones,_______ the number of mobile users has greatly increased．

#79738

while; when

when; what

before; that

when; that

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Don't come ___ you are invited.

#79759

unless

if not

why

that

English is a language shared by several different cultures, but each of ______ uses it somewhat differently.

#31349

which

what

them

whom

People were perhaps more honest a long time ago when life was very different from _________ it is today.

#32920

which

that

what

how

Jim was born on a farm, _____, he knows little about farming.

#31359

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and

yet

otherwise

 I’m sorry you’ve been waiting so long , but it will be an hour       David gets back .

#31813

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after

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