---Why are you so happy?
--- ______ the teacher’s help, I found the answer ______ the question.
| A．Under; to | B．With; to |
| C．Under; of | D．With; of |
By the time I got home, Gina and her sister ______ their project already.
| A．finished | B．have finished |
| C．had finished | D．will finish |
—I think you can ______ money by yourself to buy a present for your mother.
—OK. I’ll try. I’ll not let a penny waste.
| A．spend | B．save | C．cost | D．leave |
—I think the man over there must be Bob.
—It ______ be him. He has gone to Paris.
| A．can’t | B．can | C．may not | D．mustn’t |
Everyone knows that Diaoyu Island belongs ______ China.
| A．with | B．to | C．in | D．of |
--- Dad, I'm going for Jim's birthday party. I'll be back before 10:00.
--- ____________.
| A．Be careful. | B．Come home early. |
| C．Have great fun. | D．Really? |