Past perfect 7 Complete the text with the past simple orpast perfect form of the verbs in brackets.Emma (1) ... (not go) abroad before she wenton a school exchange to France. In fact, she(2) ... (not spend) more than a weekendaway from home before. At first, she was a bitnervous. Before she (3) ... (go), her parentshad told her to phone as often as she wantedBut then she wasn't homesick at all, and she(4) ... (have) a great time. The only bad thingwas when they had snails for dinner. She(5) ... (never eat) snails before!​

1) I would be happy to accept your invitation. I was always looking forward to participate in the exhibition.
2) I will response your invitation on conference. Can you submit your materials, consideration and comment? Your earliest response would be appreciated.
3) I very much regret I can't accept the invitation. Attend to talk, since next month it comes the middle of the academic semester and i have lectures to present.
4) I regret I cannot accept your kind invitation. I hope i'll be able to visit you some times in the future.