1．A secondgrade wind makes the tips of the branches tremble ________ (slight)．
2．My brother spends hours on the phone ________ (chat) to his friends.
3．At present the local government is taking ________ (measure) to reduce the pollution.
4．The pianist ________ (surround) by a crowd of fans will hold a concert in the Workers' Stadium.
5．Black ________ (Canada) jazz pianist Oscar Peterson is one of the greatest pianists in jazz history.
