When a space shuttle has accomplished its _____, it can be ready for another trip in about two weeks.
―David has made great progress recently. ―,and.
At no timethe first to use the nuclear weapon.
The teacher gave the books to all the students exceptwho had already taken them.
Bill is good at playing football,but whencomes to basketball,he knows nothing.
It is not so difficult to learn program well. you need is patience and persistence.