You should have put the milk in the ice box. I expect it ___undrinkable by now.
| A．became | B．had become | C．has become | D．becomes |
I have _______ my memory for his name, but I can’t remember it.
| A．searched | B．searched for |
| C．been in search of | D．searched of |
It is reported that two schools, ________ are being built in my hometown, will open next year.
| A．they both | B．which both |
| C．both of them | D．both of which |
The scientist knows nothing about the matter, because he is always ______ himself in scientific study.
| A．burying | B．devoting | C．focusing | D．concentrating |
All the people present at the meeting felt _______ at the ______ decision announced by the manager.
| A．shocked; shocking | B．shocking; shocked |
| C．shocking; shocking | D．shocked; shocked |
__________ you have made a promise, you should carry it out.
| A．Once | B．Until | C．For | D．While |