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6. The invention of the computer is a great        (achieve) ， or else we wouldn't now be living in the Information Age.

5. I        (shall) take up drawing if I have time.

4. To make members of the team perform better,the trainer first of all has to know their        ( strong) and weaknesses.

3. She doesn't care about what others think; she's not at all sensitive to other people's (feel) .

2. As is known to all,good friends add        (happy) and value to life.

1. We have been told that under no circumstance may we use the telephone in the office for        (person) affairs.

5. You mustn't bother to post the letter for me. I'll be going out myself soon.

4. Our English teacher has been abroad for a month. You mustn't have seen him today.

3. I'm sorry I'm late. I ought to take a taxi.

2. I didn't take an umbrella today so I should stay there until it stopped raining.