My English teacher always comes into the classroom____a smile．（ ）
| A． |
by |
B． |
for |
C． |
on |
D． |
with |
Mike，who helped make the paper plane？
Nobody! I made it all by myself．（ ）
A．yourB．yoursC．youD．yourself
Your head teacher has set up a Wechat group．Could you tell____？
It is more convenient to communicate with our parents．（ ）
A．when it was set upB．why did he set it up
C．what it is used forD．how did he set it up
Do you know the scientist Tu Youyou？
Yes，she is the first Chinese ____won a Nobel prize in science．（ ）
A．who haveB．that haveC．which hasD．that has
My uncle is against wasting anything．
No wonder he would rather ____the old bike than ___a new one．（ ）
A．repair；to buyB．to repair；buy
C．repair；buyD．to repair；to buy
Would you like to go swimming in the river，John？
Swim？Sorry，our teachers always tell us ____in the river alone．（ ）
A．don't swimB．to not swim
C．not swimmingD．not to swim