Вставьте пропущенные слова, союзы и т.д. 1) I always keep my dictionary close _ hand. 2) I can't stand it when my classmates laugh _ me. ...

Вставьте пропущенные слова, союзы и т.д. 1) I always keep my dictionary close _ hand. 2) I can't stand it when my classmates laugh _ me. 3) Sorry, but I can't work _ what you mean. Could you explain to me? 4) She is very concerned _ environment problems.