—How long do you think it will be ________ we win the football World Cup?   —Perhaps twenty years.

English differs from Spanish in ______ it is not pronounced as it is written.

 ________ you read English easily, you'll find it is another cup of tea to make conversation in English.

单项选择（每题1分）We must think twice _____ we make the final decision.

I set up e-mail addresses for my mum and dad ________ I could e-mail them regularly.