21．----I’m going downtown.。
----Come on, _______.
A. I’ll give you a lift B. You are welcome C. Don’t do that D. Come with me
22．It was on the farm _____he spent his childhood _____he learned how to grow vegetables.
A. where, that B. which, when C. that, that D. that, which
23．---- Ricky, why haven’t Billy been with us these days?
---- Oh, he is _________for next month’s 400m race.
A. standing out B. taking up C. backing out D. working out
