Chia động từ trong ngoặc: She (study) English when the old teacher (come) here

Chia động từ trong ngoặc:
1) she (study) english when the old teacher (come) here
2) he spent 2 hours (plant ) these trees
3) he (meet) me as soon as he (finish) the work
4) It takes us 2 hours (do ) exercises
5) It is high time all 9A students (learn) hard
Viết lại câu:
1) he spent too much time doing exercises
=> It took ...
2) the girl is workinh here. Her sister is receiving a gift
=> the girl ....
3) the book is very interesting
=> what.....
4) the book is interesting . We bought it yesterday
=> the book....