1. we are going to write ..a. test. ..the. test is rather difficult
2. they have got .a.. cat and..a dog at home. .the.cat always scratches ..the. dog
3. i saw ..a. car...the car stopped outside our house.
4 there is ..a. new student in our class . ..the. student is from Italy.
5. you should take ...a knife to open the tin. ..the. knife is in box.
6. mary has got .a.. good job, She devotes much time to ..the. job,
7. Her son got..a bad mark at school yesterday, but ..the. mark didn't upset him
8. They gave ..a. party last week. everybody enjoyed ..the. party
9. he met ..a. girl at the disco, .the. girl was ..a. nice dancer.
10. my brother bought ..a new flat. ..the. flat is small but quite comfortable.
11. she saw ..a. nice dress in the shop, but .the.. dress was to expensive for her to buy it
12. i have .a.. CD player, but .the.. CD player doesn't work.