_____on the grass _____singing and laughing.

The leaders from some of the countriessuggested the nuclear weapon about Iran worth paying attention _______ at theinternational conference.

_______ can the batteries (电池) keep these cool iPhones and iPads working- For about ten hours.

In order to _______ a good knowledge of English ,he gave up his job and went to study in an English school.

In spite of repeated wrongs done to him, he looks _____ to people greeting him.