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 |
I can’t remember how the tune goes, ______ I’ll recognize it when I hear it.
| A．so | B．but | C．because | D．unless |