My sister often helps me _______ my lessons.[ ]

How was the English evening party last night?-It was great fun. You ______ come.

_______ of the materials I listened to at the beginning of the exam _______ easy.

We don’t want to speak badly or ______ in front of the class.

Which of the two English dictionaries will you buy?——I’ll buy ________ of them, so I can give one to my friend Helen.