ou,butI’llhaveto_______youroffer.

I’m sorry I didn’t phone you, but I’ve been very busy_______ the past few weeks.

There is little milk left in the bottle,______

Since the Obama administration took office,the China—US relations ________ positive development thanks to joint efforts ofboth sides, President Hu said at the Nuclear Security Summit inWashington, April,12,2010.

I think nobody makes_______ contributions to the company than him.