Our garden is very beautiful, ____ in spring.

I wonder why Jack always gets good marks when he does only ______ the others.

I hear Sam has gone to Qingdao for a holiday.—Oh, how nice! Do you know when he________?

I’m going to learn the piano when I retire.—That sounds_____ a good idea.[ ]

Do you think the last problem in this math test difficult?—Yes. I could work it out.