Sam spends two hours _______ his homework every day.A. to do B. doing C. do
I had to buy ________ these books because I didn't know which one was the best.
Don't make____________same mistake for the second time in____________day.
--- _______________________? --- I’m fine, thanks.
--- What class are you in? --- I’m in ________________, Miss Li’s class.
--- Ms Chen is our Chinese teacher. Let’s ________ “Hello” to her. --- OK.