根据汉语意思完成句子 。
1．我将考虑当一名老师而不是工人。
I'll _____ becoming a teacher_____a worker.
2．我去过长城好几次了。
I __ _____to the Great Wall several times.
3．如果你去说英语的国家旅游，学英语是必要的。
If you travel to _____countries, it is necessary _____English.
4．游览那个水上公园最好的方法是乘船。
The best way the water park is _____a boat.
5．他们作为交换生在新加坡学习英语已一年了。
They have been learning English as in Singapore __ a year.
