Lisa, what do you think of the job of being a nurse— In my opinion, it ________ be difficult sometimes though it seems easy.

I’m not a little tired today after giving the room a thorough cleaning and I have never had ______today

I feel very happy that I _________ to be the host .— Congratulations .

than _____on a crowed bus, I prefer____to work every day

A number of students_______ playing on the playground, but I don’t know what the exact number_______.