.—Let’s throw a surprise party for mom’s  50th birthday.
—That’s a good idea. We_________several of her friends.
| A.invite | B.had invited | C.are inviting | D.will invite | 
—What will you be doing at 4:00 tomorrow afternoon?
 —I _____ in my office.
| A.will be typing | B.am typing | C.am about to type | D.will type | 
The school _______ he once studied in is famous.
| A.where | B.in which | C.in that | D.that | 
—Really ? Who will give ____lecture ? What is it about ?
 —Professor Chen , ____president of Beijing University . About pollution .
| A.the ;a | B.the;/ | C.a ; the | D.a ;/ | 
Children are likely to get _____ if no one cares about their upbringing.
| A.out of hand | B.out of order | C.out of place | D.out of work | 
– Can those ____ at the back of the classroom hear me?
| A.seat | B.sit | C.seated | D.sat |