How much trash has been left on the mountain? A. Four hundred kilos    B. Four thousand kilos C. Five thousand kilos    D. Fifty thousand kilos

She hasn't written to me for years.

=> It's years ____________________.

The beach is close to the hotel, so we can walk there.

=> We can go ______________________.

Thu often uses English to talk to Dave and Mary.

=> Thu often talks _____________________.