This work, when we find it and do it----_________only as a hobby at first---is a key to our true happiness.
| A．even if | B．only if | C．as if | D．if however |
Weteachersmustseeto________thateverystudentcanunderstand.
| A．all | B．that | C．it | D．one |
Mary has been looking forward in the past 10 years to______the Great Wall.
| A．payingavisitto | B．callon | C．beingonavisit | D．callat |
It won’t be too long before we_____a way to smooth away these difficulties.
| A．work out | B．willworkout |
| C．had worked out | D．are working out |
Muchashelikedthebook,____hedidn’thaveenoughmoneytobuyit．
| A．but | B．and | C．therefore | D．/ |
Atlasttheygottheletterthey____________．
| A．haveexpected | B．wereexpecting | C．hadexpected | D．hadbeenexpecting |