Science and technology is changing fast nowadays. I bought this MP3 player at the beginning of this year but now it’s out of ________.

It was ______ he does ______ makes his students enthusiastic about school.[ ]

Where are Tom and Mary–____ Tom _____ Mary is busy with theirhomework. You’d better play with.

esident expressed his satisfactionwith the co-operation, that he hoped tohave another one

Are you sure that he will come here in time— You may ______ he will come to help us though heis very busy.