________ I’m willing to help you out of trouble, you know, I don’t have much time available.
| A．Since | B．Unless | C．If | D．While |
So difficult ________ it to live in an English-speaking country that I determined to learn English well.
| A．did I feel | B．I did feel | C．have I felt | D．I have felt |
— Why didn’t you come to Mike’s birthday party yesterday?
— Well, I _______, but I had something important to do at the moment.
| A．should | B．must | C．should have | D．must have |
Look at the timetable. The flight to Shanghai _______ off at 10:00.
| A．is taking | B．takes | C．will be taken | D．will take |
_______ many people first go to the Internet for information, it is not always the best place for what you need.
| A．As | B．Since | C．When | D．While |
The boy was beaten by his stepmother, tears _______ down his cheeks quietly.
| A．flew | B．flowing | C．flown | D．to flow |