Chia động từ: There has been a great (improve) in his English

25. There has been a great (improve) in his English.
26. I'm afraid you don't have the necessary (qualify) for the job.
27. Goods are (change) as long as they are returned in good condition.
28.when you attend the examination, you are an (examine)
29.Many (picnic) have decided to go camping on the river bank
30.Let me introduce you a (repute) university. I think it's really reliable.