1. Please be quiet. I ____________(to try) to concentrate.
2. The police _________(to stop) him on his way home last night.
3. They ________ (to start) working there two years ago.
4. The scientists __________ (to research) the problem since 2013.
5. She __________(to take) course of the developmental psychology next year.
6. They _____________(to work) in the lab this week.
7. We ______________(to know) the results of the experiment in two days.
I think we _______________ (to meet) many interesting people during our practice.
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