几道英语选择题,分析原因1、It's_____ to plant trees on the hillA a hard w

几道英语选择题,分析原因
1、It's_____ to plant trees on the hill
A a hard work B hard work C work hard D difficult works
2、____ our duty ____ the wild animals in danger
A That's;to protect B It's; to protect
C This is; to protect D That's; protecting
3、The doctor told him to eat the medicine____the right time
A、on B in C at D for
4If you can't decide which of the two novels to borrow,why don't you take_____
I won't read them this month
A both B all C any D either