You were stupid to climb up that big tree. You ______ yourself.
| A．must have killed | B．can have killed |
| C．should have killed | D．might have killed |
Many grownups ________ challenging conversations with their children later this month to help them recover from the panic.
| A．have had | B．have | C．will be having | D．will have had |
—Bill，can I get you anything to drink?
—________.
| A．You are welcome | B．No problem |
| C．I wouldn’t mind a coffee | D．Doesn’t matter |
Mr Green is fond of rock music,___________his wife has no interest in it at all．
| A．however | B．while | C．as | D．unless |
The knowledge________in one’s childhood will make a stronger impression on him than what he learns at any other life stage.
| A．acquired | B．acquiring |
| C．being acquired | D．having acquired |
When you stand on the top of the mountain and overlook the surrounding scenery，you’ll find it is________to climb it up with effort.
| A．worth | B．worthy | C．possible | D．worthwhile |