I am really proud of my group _______ we're always discussing and sharing study secrets together．How important the group work is!（ ）
| A． |
because |
B． |
though |
C． |
unless |
Great changes in my hometown recently.
A.took place
B. happened
C.have taken place
--- What are you doing here, Mrs. White?
---I'm waiting for my son. He________ back from school.
| A．hasn't come | B．won't come |
| C．doesn't come | D．didn’t come |
Shenzhou X, China’s fifth manned spacecraft, ________into space on June 11. 2013.
| A．has sent | B．was sent |
| C．will send | D．is sent |
That poor man has for three years.
A. died
B. been died
C. been dead
Jack _______ many English books in the past three years.
| A．read | B．reads |
| C．has read | D．was reading |