1.A
to drink做sth的后置定语
2.traveling
这里go traveling是固定搭配,就像是go swimming, go shopping, go cycling等一样
3.to play
Sth take(s) sb somg time to do sth
4.watches
因为有usually表示经常性,用一般现在时,又因为是my sister是第三人称单数
5.has worked
后有for+一段时间要用现在完成时
6.Both of Anne and Helen sing well.