Why don’t you want to travel abroad?— Because it becomes ________ expensive ________ before.

If you always ______ others like that, you’ll forfeit ( 丧失) the good opinion of your friends. [ ]

______ you’ve got a chance, you might as well make full use of it.

The milk must be preserved at this temperature untilit ____.

The failure was a big _________ to him, but he didn’t _________ and soon got as enthusiastic as ever.