—Which month has ______ days in a year?—February.

－Many boy students think math is ______ English.－I agree. I’m weak in English.

Do you know of all the words we used in 2011 "hold" became      in China? 

 We should eat _______ fruit and vegetables, but _______ meat. It is good for our health. 

—We're doing a lot to protect our environment, but it is not good enough. —So we should try______ to look after it.