Tom is tall, but his sisters, Mary and Kathy,       short.

I don’t study as ______ as Amy and always make more mistakes in my homework．

Don’t hurry. There are twenty minutes left. It’s _____ for us to get to the cinema.

Please don’t drop litter _______, you should throw it into the dustbin _______.

— _________ has Liu Xiang taken part in world’s competitions of 110-metre hurdles?— I’ve no idea. Let’s find it out on the Internet.