E.complete the following blanks with either simple past tense or present perfect tense.
1. Karen: Where is your brother?
Fred: He _______ (go) t Australia.
Karen: When ________(he/leave)?
Fred: He _______ (leave) last week and will be back tomorrow.
2. Mrs. Kwan: I ______ (hear) that your son _________ (win) in the piano contest yesterday. Congratulations!
Mrs. Fung: Thank you.
mrs. Kwan: How _______ (you/celebrate) with him ?
Mrs. Fung: Actually we ______(celebrate) with him yet. His father is now on a business trip and we want to wait for him.
3. Martha: I know Kelly Chen.
Jason: Really? How long _____ (you/know) her?
Martha: Oh, for quite a long time now.
Jason: When ____(you/first/meet) her?
4. Helen: Do you like the film 'Wanted' ?
Sally: I don't know. I ____ (not watch) it yet. When ____(you/watch ) it ?
Helen: I ____(watch) it last Sunday.
5.Mother: _____(you/sweep) the floor yet?
Daughter: I______(sweep) the floor yesterday, but I ________ (not have) time yet to do it today.
Mother: _______(you finish) your homework yet ?
Daughter: No, I__________(return/just) from school.
6. Wendy: _______(be/you/ever) to Africa?
Keith: Yes, I __________(visit) Egypt two years ago. How about you?
Wendy: I________ (be/never) to Africa, but I _____(travel) to South America last month.