1 . I have some difficulty ___________(carry) out the plan. This is why I turn to you for assistance. (所给词的适当形式填空)

2 . It _______(hope) that one day there will be enough animals to let them live in the wild again.

3 . It ________ (occur) to Jane that she had overlooked an important detail in her presentation while she was already standing before the audience. (所给词的适当形式填空)

4 . I __________ just fallen asleep __________ the door bell rang. (用适当的词填空)

5 . When it comes ___________ speaking in public, no one can match him. (用适当的词填空)

6 . It is a waste of time_______ (spend) so much precious time playing online games. （所给词的适当形式填空）

7 . I was about to give up________my best friend encouraged me to go on. (用适当的词填空)