. There ______ a meeting tomorrow afternoon.

Mr Smith always goes for a walk with his dog when he is_________.

Could you tell the differences _____ these two words? — OK, let me have a try. [ ]

The poor monkeys got ill ________ the bad food people fed it.[ ]

What do you think of the four classics (名著)of China?－I hear that they are wonderful, but I’ve read _______ of them.