We are bound ______ with difficulties in carrying out this research.
| A．to meet | B．to have met |
| C．meeting | D．having met |
So far we have done a lot to build a low-carbon economy, yet it is still _________ ideal. We have to work even harder.
| A．far from | B．next to | C．out of | D．due to |
______ it rain heavily tomorrow, we would have to put off the visit to the Forbidden City.
| A．Were | B．Should | C．Would | D．Will |
________ repeatedly, the problem still appeared in the beginners’ homework.
| A．Explaining | B．Having explained |
| C．Having been explained | D．To be explained |
---It is what parents say and do that really matters in children’s character training.
---________.
| A．Properly | B．Doubtfully | C．Simply | D．Absolutely |
_______ weather it is, we shall set out on time.
| A．Whatever | B．However | C．Whenever | D．Whether |