When ______ by the teachers, a student tends to studyharder than usual.

It is really ______to look out ______ the sea when it is fine.

At that time I had no idea ________ Icould hand it to him without being seen.

It is I against the plan, because it sounds impossible to carry out.

They_____thatfar;buttheystoppedtohaveasnackontheway