---Why do you look so upset?
---There are so many troublesome problems _____.
| A．remaining to be settled | B．remained settled |
| C．remaining to settle | D．remained to be settled |
The managers discussed the plan that they would like to see ______ the next year.
| A．carried out | B．carrying out | C．carry out | D．to carry out |
______ production up by 60%, the company has had another excellent year.
| A．As | B．For | C．With | D．Through |
The father as well as his three children ______ skating on the frozen river every Sunday afternoon in winter.
| A．is going | B．go | C．goes | D．are going |
Occasions are quite rare ______ I have the time to spend a day with my kids.
| A．when | B．which | C．why | D．who |
Two middle-aged passengers fell into the sea. ______, neither of them could swim.
| A．In fact | B．Luckily | C．Naturally | D．Unfortunately |