There are some health problems that, when ________ in time, can become bigger ones later on.
| A．not treated |
| B．not being treated |
| C．not to be treated |
| D．not having been treated |
Either you or any of your family ______ to attend the important banquet that is due tomorrow.
| A．are | B．can | C．have | D．is |
Tom,you and I could hardly work out the mathematic problem, _______?
| A．could you | B．couldn’t I | C．couldn’t we | D．could we |
Even many years after his divorce, he still couldn’t figure out the reason for his ____ marriage.
| A．to fail | B．to be failing | C．failing | D．failed |
— Has Mr. Tom White arrived?
— Yes, already. _____ he wait outside or just come in?
| A．Shall | B．May | C．Could | D．Must |
So far this year, no measures _______ against cruelty to animals despite their protest in the
newspaper.
| A．have taken | B．have been taken | C．had been taken | D．had taken |