He played on the _____ for 2 hours and when he returned he found half his goods
_____ stolen.
| A．sand, were | B．sand, was | C．sands, were | D．sands, was |
In the near future more advances in the robot technology ______ by scientists.
A are making B in made C will make D will be make
Jack wasn't saying anything but the teacher smiled at him ____ he had done something very clever.
A as if B in case C while D though
Only after they had discussed the matter for several hoursa decision.
| A． |
they reached |
B． |
did they reach |
C． |
they reach |
D． |
do they reach |
Before a problem can be solved, it must be obvious ______ the problem itself is.
A. what B that C which D why
It is the most instructive lecture that ________since I came to this school.
A attended B had attended C am attending D have attended