用所给词的适当形式填空
【小题1】The population of China __________（be）about 1.3 billion in 2005.
【小题2】The road to __________（succeed）is to work honestly.
【小题3】Never give up! Pain always comes with __________（achieve）.
【小题4】What a pity! Sue lost the game because the __________（weigh）of her shoes made it difficult for her to run fast.
【小题5】To complete the work, he drank some coffee to keep himself __________ （wake）.