The wet weather will continue tomorrow when a cold front ______ to arrive.

Jane _____ these families of chimps for many years and helped people understand how much they behave like humans.

Professor Williams keeps telling his students that the future       to the well- educated.

Great changes have taken place in China since the People’s Republic of China     
in 1949．

If the weather had been better，we could have had a picnic．But it         all day．

－Have you known Dr Jackson for a long time?
－Yes，since she         the Chinese Society．

It        long before we        the result of the experiment．

Months ago we sailed ten thousand miles across this open sea，which         the Pacific，and we met no storm．

My little son used to drink a lot of fruit juice but these days he        mineral water．

Ladies and gentlemen，please fasten your seat belts．The plane       ．