—I don’t know much about computer.
—I don’t know, . Let’s go and ask our computer teacher for help.
| A．also | B．either | C．too | D．as well |
I couldn’t work out this problem ________ my teacher helped me.
| A．before | B．unless | C．because | D．until |
_________ my mother was washing clothes, my father was reading books.
| A．While | B．When | C．Before | D．After |
When the first ______ came to the US, they were hungry as they have nothing to eat.
| A．students | B．pioneers | C．heroes | D．soldiers |
Spring is the best _______ of the year, because we can see lots of beautiful flowers.
| A．date | B．day | C．season | D．vacation |
I ________ the room yesterday, so it is not dirty today.
| A．clean | B．cleaned |
| C．will clean | D．is cleaning |