Having a trip abroad is certainly good for the old couple, but it remains ______ whether they will enjoy it.
| A．to see | B．to be seen | C．seeing | D．seen |
I think you should go back to your _____ plan, which is much more practical than the present one.
| A．random | B．original | C．abstract | D．ridiculous |
——Jim is addicted to novels recently.
——Yes, that might _____ why he did so badly in the last test.
| A．answer for | B．apply for | C．account for | D．call for |
I was surfing the Internet _____of successful rendezvous and docking of Shenzhou-VIII and Tiangong-I.
| A．when suddenly came the good news |
| B．while the good news came suddenly |
| C．when suddenly did the good news come |
| D．while suddenly came the good news |
No one expected house prices to fall, but _____ that's exactly what happened.
| A．moreover | B．thus | C．anyway | D．however |
Many people can't learn any lessons from the mistakes they've made _____ they get hurt somehow.
| A．whether | B．unless | C．if | D．as |