Notuntil they left school ______ how much their teachers loved them and helpedthem.

He left school early, and as an adolescent, determined______ in South American, set off from his home.

It is surprising for them to complete _____ work in _____ [ ]

____ animals are in danger and there will be ____ space for them if we don’t take any actions.

The sooner we students ________to the new school，the better it will be ________our studies.