--- The fog is so thick that the express way ____ have been closed.
--- You are right. I ____ have thought of that. Now we have to take another road.
| A．can; should | B．may; can | C．should; must | D．must; should |
The fact has worried people _______ the number of the deaths is still increasing.
| A．what | B．which | C．that | D．when |
Either you or he _______ to give them a lecture tomorrow.
| A．is | B．are | C．has | D．have |
I _______ online games for two years, but I’ve never regretted giving it up.
| A．play | B．was playing | C．played | D．had played |
Many children always disagree with _______ their parents suggest.
| A．however | B．whatever | C．whichever | D．whoever |
He is always telling the director how to run the business, _________ is like teaching one's grandmother how to suck eggs.
| A．that | B．which | C．what | D．as |