---- Putting on a happy face not only helps us make friends but also makes us feel better.
----.
| A． | I'd love to | B． | I'm with you on that | C． | It's up to you | D． | It's my pleasure |
Every device ______in the plane must be designed and made with great care so as to make sure that nothing goes wrong in operation.
| A．fitted | B．to be fitted | C．fitting | D．being fitted |
He left home early only______he was late as he went a wrong way.
| A．found | B．to find | C．finding | D．being found |
— Beijing or Shanghai? What did you mean?
— We were talking about _______ go to college.
| A．how to | B．where to | C．whether to | D．when to |
When he was a boy, he used to go there and watched _______.
| A．repairing bicycles | B．to repair bicycles |
| C．bicycles being repaired | D．bicycles to be repaired |
Robert is said______ abroad, but I do not know what country he studied in.
| A．to have studied | B．to study | C．to be studying | D．to have been studying |