英文缩写H1N1 的含义是_______________.硬黑 B. 光盘 C. 甲型流感 D. 乙型流感
He doesn’t know _________. A、to do what B、how to do C、what to do
He also _________ some signs asking for old bikes. A、put down B、put up C、put off
Study hard, _____you will get better grade. A、or B、and C、because
He pretends _______this thing. A、not know B、not knowing C、not to know
Tom, your hair is too long. Would you please get your hair? A、cut B、to cut C、be cut