The math problem is so hard, I really don’t know _____.
Hello! What _______this?
--What's this _________English? --It's a clock. A.of B.on C.in
下面表示重量单位的是________________. A.NBA B.P C.kg
This is _________orange. That's_________pen. A.a ,a B. an;a C.a;an
按字母顺序排列正确的一项_________________. A.d c e a B.c d e f C.d f g e