根据汉语提示，完成下列句子。（每小题1分，满分5分）
________  _________(至今为止) we have learnt 1500 English words.
Xiao Lin has joined the Helpers’ ________(俱乐部) since 2004.
_______ _______(幸亏) the government’s efforts, my hometown is becoming better and better.
If we agree with someone, we can ________(点头) our heads.
The weather in the south of China is __________(干燥的) in fall.