I hurt my leg badly, so I __________ go to school tomorrow.
How many workers are there in your factory?-______ the workers in my factory_______ over two thousand .
Have you watered the plants yet, Kathy? —Yes. I ________ that this morning.
Robert is_____ tired_____ move after the hard work.[ ]
Li Yundi began to learn the piano _____ the age of four and took part _____ the 14th Chopin International Piano Competition in 2000.[ ]