How long can I keep the book? —-A week．You _____to return it by Monday

President Obama promised victims of the deadliest accident in 65 years ______ the government would help them

Trees need water to grow; _____, friendship needs our heart and passion to develop

y, haven’t seen you for a long time.__________— Fine. What about you

Clothing made of man-made fibers has certainadvantages over ______ made of natural fibers like cotton，wool or silk