Such a problem is＿＿＿＿difficult for a primary school student ＿＿＿.
| A．so； to work | B．very too； to work out |
| C．rather too； to work out | D．quite too； to answer |
Her handbag is on her desk. She ____ back home.
| A．must go | B．can’t go | C．must have gone | D．can’t have gone |
He seems ____ something valuable. He looks so worried.
| A．has lost | B．to lose | C．to be losing | D．to have lost |
Don’t take her seriously, she’s just ____.
| A．acted out | B．acted up | C．acting out | D．acting up |
We will have more money to spend after we ____ our mortgage (贷款).
| A．pay off | B．pay for | C．pay on | D．pay down |
It’s hard to finish the work in a day. You’d better ____ your friends to help you.
| A．call for | B．call on | C．call at | D．call up |