If only I＿＿＿＿＿how to operate a computer as you do!
| A．had known | B．wou欤?know | C．should know | D．knew |
Only then __________how much damage had been caused.
| A．she realized | B．she had realized |
| C．had she realized | D．did she realize |
To understand the grammar of the sentence, you must break it ______into parts.
| A．up | B．out | C．off | D．down |
Tom’s hearing is _______.
| A．dropping | B．failing | C．going | D．falling |
You’d better not leave the medicine ______kids can get at it.
| A．where | B．which | C．even if | D．so that |
Next to chemistry, he likes physics ______.
| A．the better | B．best | C．better | D．very well |