______ without friends ______ the most difficult challenge for Chuck while living on the island.
Stand over there ,___you will be able to see the oil painting better. A. but B. till C. and D or
Every pupil is ______to be in the classroom at 7.am.
He ____in Nanjing where he ___by his aunt.
The doctor ____me ______more exercise.
A small car is big enough for a family of three ___you need more space for baggage.