Up to Tuesday's attack, the worst school shooting in the U. S. was in March 1998 in Jonesboro,________ two boys, aged 11 and 13, shot and killed a teacher and four girls.
| A．while | B．where | C．when | D．then |
The teacher as well as the students _______planting trees.
| A．are | B．is | C．has | D．have |
_______ is known to all, smoking is harm our health.
| A．As, for | B．As, to | C．It, for | D．It, to |
__surprised me most was ___ Mary spoke Chinese just like a native speaker.
| A．That, what | B．Which, that | C．What, that | D．That, that |
--- Would you mind my opening the window. It is too hot.
---- .
| A．No, please don’t | B．Yes, go ahead | C．Yes, please | D．No, go ahead |
---- People are in great need of this kind of food.
----Yes. It’s really a problem that how to _________ the needs of them.
A give B. gain C. satisfy D. produce