Where is Jack? —I noticed that he ________the teacher’soffice just now.

The question came up at themeeting_____ we had enough money for our research

Give the message to ______ is at the table.

I find the more we study, the more difficulty we have _______ out Maths problems.—Oh, I agree with you. Maths is more and more difficult.

earthquake hit Ludian in Yunnan, ________ many deaths and injuries and a big loss of property.