We should prevent such a silly mistake _____ again. [ ]

I’m hungry, what’s for the supper? ____—I haven’t, actually I’ve just made a large salad, but there’s loaf of fresh bread if you want to

By nine o’clock, all the Olympic torch bearers had reached the top of Mount Qomolangma, _______appeared a rare rainbow soon.

The system has been designed to give students quickand easytothe digital resources of the library.

Uner good treatment, many patients are beginning to _______ and will soon recover．