The roads are lined _____trees, which have been planted to hold _____the strong winds from the north

It is believed that travelling to Nanjing in _____ March is ______enjoyable experience.

President Nixon was deeply_____in the Water Gateproblem at that time.

Is that _ _ schoolbag —No. __ _is white.

Your desk is crowded with too many unnecessary things, including used papers and books.You’d better________some of them. [ ]