.---I’m going to the States for further study.
---How long ____ you ___there?
| A．had , stayed | B．did, stay | C．have, stayed | D．are, staying |
cheer
| A．stomach | B．character | C．chain | D．chemist |
theater
| A．pleasant | B．breathe | C．really | D．deaf |
island
| A．surprise | B．machine | C． invite | D．children |
The sight of the big cake on the table suddenly _________ me that it is my birthday today.
| A．remembers | B．impresses |
| C．confirms | D．reminds |
This produced a chain reaction, _______ made _______ possible for life to develop.
| A．what; that | B．which; it |
| C．when; that | D．how; it |