u think it’s a good idea to makefriends with your students —_______, I do. I thinkit’s a great idea.

下列所给词语的划线字解释错误的一项是

.. —All the building materials have been washed away.—So I have heard. But there was no sign ______ a heavy rain was on the way last night.

Nobody but I ______the secret.

The houses in big cities are so expensive that I can’t __________ to buy one .