The boy is old enough to __________the difference ________right and wrong.
| A．speak; from | B．tell; between |
| C．say; of | D．judge; from |
_____was known to them all is that Bob had broken his promise____he would give them a rise.
| A．As; which | B．What; that | C．It; that | D．It; which |
Please tell me how the accident _________ . I am still in the dark.
| A．come to | B．come by | C．come across | D．come about |
Jack always sleeps late on Sundays. I am sure he _______ when we get home.
| A．is still sleeping | B．is to be sleeping |
| C．will still be sleeping | D．will have been sleeping |
The box ____ two meters by two meters and ____ a ton.
| A．measures; is weighed | B．is measured; is weighed |
| C．is measured; weighs | D．measures; weighs |
It never occurred to humans until the mid-1990s ______ some animals can be cloned.
| A．where | B．that | C．when | D．what |