Quite a few tall buildings _______ the lasttwo years

Would you like to go for a picnic to enjoy the fresh air outside this weekend — __________. It will be a sunny day.

The trapped car could hardly make anyadvance and ________ could it draw back in the mud.

What’s Mary going to do this coming weekend—– I’m not sure. She ____________ go to the country to see her aunt.

Her father tried to______ that nothing unusual had happened. —In fact,it was not serious.