Choose the correct form of the verb.
They the company two years ago.
a) started b) have started
them since December
a) didn't see b) haven't seen
He a new car two weeks ago.
a) bought b) has bought
• We back on Monday afternoon.
a) arrived b) have arrived
They already
the problem.
a) solved b) have solved
It
a lot last winter.
a) snowed b)has snowed​