很高兴能够在这里回答你的问题：
our host family was very(friendly) to us when we were in america last year
去年我们在美国时,房东对我们很友善.
if you don't know the meaning of this word you can look it （up) in dictionary
look it up 查字典
i didn't_（catch)the school bus this morning because i got up too late
因为我起晚了,所以今天早上我没赶上校车.
this problem is not difficult so i can solve it by（myself)
这个问题不难,因此我可以自己解决它_