For forty years Jane has been ___________ about making the rest of the world understand and respect the life of these animals.

Not onlyhelp him with his maths, but you should help him with his English. [ ]

TV and computer are so popular these days.——Yes, they can ____ our eyes to the outside world.

What do you think of the lecture of Li Yang’s Crazy English?— I think it’s _______ , but someone thinks it’s much too ________.

The students are cleaning their classroom. _____ are cleaning the windows. _____ are cleaning the chairs.