第107页 - 初中英语课课练九年级译林版

Don't touch the instruments if the teacher doesn't allow you to.

Mary can't see clearly unless she wears glasses.

won't catch the train

unless you take the underground

recommend a programme to

if you find it interesting

If it doesn't rain tomorrow, the sports meeting will be held on time.

If you listen to your teacher carefully, you will know what to do next.

you have little interest, you will have a chance to see how a TV programme is recorded

I won't tell them anything unless