His lack of professional knowledge ______for the failure of the experiment. [ ]

The scientist suggested ____ the experimentin a different way.

Physics _______ an easy subject for me when I wasyoung. I usually got high marks then.

Tom wants to be a singer and he_____ singing lessonsto do it.

ople’s great surprise, in Japan Earthquake, a young man ________ the big earthquake under the ruins where he stayed 7 days without anything to eat