现在
科学发展观是用来指导发展的，不能离开发展这个主题，离开了发展这个主题就没有意义了。这告诉我们，树立和落实科学发展观，必须始终坚持（ ）。
科学发展观是用来指导发展的，不能离开发展这个主题，离开了发展这个主题就没有意义了。这告诉我们，树立和落实科学发展观，必须始终坚持（ ）。
Something must have happened on their way. Or they _____ by now.
Something must have happened on their way. Or they \_\_\_\__ by now.
If I _____ you, I _____ more attention to English idioms and phrases.
If I \_\_\_\__ you, I \_\_\_\__ more attention to English idioms and phrases.
When a pencil is partly in a glass of water, it looks as if it _____.
When a pencil is partly in a glass of water, it looks as if it \_\_\_\__.
If I _____ the exam, he would be astonished.
If I \_\_\_\__ the exam, he would be astonished.
If you were offered a trip to the moon, _____ it?
If you were offered a trip to the moon, \_\_\_\__ it?
There is a knock on the door. It is the second time someone _____ me this evening.
There is a knock on the door. It is the second time someone \_\_\_\__ me this evening.