Đặt động từ vào đúng thì (quá khứ đơn hoặc hiện tại hoàn thành) 1) I(just/finish)____ my homework. 2) Mary( already/wirte)____ five letters. 3) Tom(move)____ to this town in 1994. 4) My firend(be)____ in Canada two years ago. 5) I(not/be)____ to Canada so far. 6) But I( already/travel)____ to London a couple of times. 7) Last week, Mary and Paul(go)____to the cinema. 8) I can't take any pictures because I( not/buy)____ a new flim yet. 9)(they/spend)____ their holidayin New Zealand last summer? 10)(you/ever/see)____ a whale?