1. The group of doctors has spent 8 months_____________ the side – effects of this new vaccine.
A. having examined B. to examine
C. examining D. to have examined
2. A: I’m trying to move this cupboard, but it’s very heavy.
B: Well, _____________ you, then.
A. I help B. I’ll help C. I’ll be helping D. I’m going to help
4. _____________ in science and technology have changed people’s life dramatically.
A. developing B. developed C. development D. developments
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