07y contextual fill-in-the-blanks: "since" vs. "for" vs. "in" with present-perfect and simple past

Supply "since", "for", or "in".
* "In" goes with years and months (ex: "in 1967"). If the year or month is in the past, then we use simple past with it, not present perfect. If the year or month is the present year or month, then we can use "in"-expressions with the present perfect (ex: "In the 2020's, computers haven't improved much").
* "Since" + a point in the past (ex: "since yesterday") means 'from ___ till now. It usually goes with the present-perfect, not the past.
* "For" + a length of time (ex: "for ten minutes") is for lengths of time. It can go with EITHER the present-perfect OR the simple past.

	First name Last name