—Sorry, Mr. Smith. I left my homework at home this morning.
—Never mind. But be careful ______ that again.
| A．not do | B．not to do |
| C．don’t do | D．not doing |
--- Jim’s seldom been late for school, _____?
---______. But he got to school on time this morning..
| A．is he, No | B．has he, No |
| C．has he, Yes | D．is he, Yes |
—Have you ever ridden a horse? —No. I’d like to, _______.
| A．too | B．though | C．yet | D．either |
.John is always praised _______ one of the top students ______ his efforts.
| A．as; for | B．as; by |
| C．for; by | D．by; for |
— Look, the man looks like Mr Green.
— It ________ be him, for he ________ America since last week and hasn’t returned..
| A．can’t; has gone to | B．may not; has been in |
| C．mustn’t; has gone to | D．can’t; has been in |
You mustn’t throw them about _________you use these plastic bags.
| A．when | B．before | C．until | D．after |