—Which bus do I need _____?—Bus No.818.A.to sit B.to take C.sitting
—Could you help me ____ my Chinese?—No problem.
—____ are new here. Let’s help ____.—OK.
—Where does he ____?—He ____ in Shanghai.
Can I________ you some questions ?
---Is this ________ white ruler ?---No. ________ is yellow.