are some health problems that, when intime, can become bigger ones later on

President Nicolas Sarkozy of France has been taking intensive English lessons in order to _____ his guests during his state visit to the UK.

_____ do you surf the Internet, Kate — Not often, twice a month.

(2014·湖南郴州五校第二次联考)Not only________to turn off the lights in the kitchen，but we also failed to lock the front door.

I ___________ through that bitter period without your generous help.