Give the correct form of the verbs in the brackets

Ex3. Give the correct form of the verbs in the brackets
1. By the time the conference ended, the keynote (chính) speaker (deliver)
______________ her presentation for nearly two hours.
2. By this time next year, they (renovate- trùng tu) ______________ the historical
museum for over a decade.
3. After the researchers (conduct) ______________ several experiments, they published
their findings in a scientific journal.
4. At this time tomorrow, the scientists (discuss) ______________ the potential impact
of climate change at the international summit.
5. If it had been for the Covid-19, our company (launch) _________________________
three new products in the market this year.